You pull a beautiful card from a booster pack. It looks perfect. You submit it for grading and it comes back as a PSA 7. What happened? In most cases, it is one of a handful of common mistakes that collectors make between pulling a card and submitting it for grading. These mistakes are preventable, but only if you know what they are.
This guide covers 15 of the most common Pokemon card grading mistakes, ranked by how frequently they occur and how much they impact your grade. For each mistake, we explain what goes wrong, how many grade points it typically costs, and how to avoid it.
Mistake #1: Touching the Card Surface
Frequency: Extremely common
Grade impact: 0.5-2 points
This is the number one killer of high grades. Fingerprints leave oils on the card surface that can cause micro-scratches when wiped off. Even clean, dry hands leave some residue. Every time you handle a card without gloves or without holding it by the edges, you risk surface damage.
How to avoid it: If you pull a card you think might grade well, sleeve it immediately. Do not pass it around. Do not lay it on the table. Penny sleeve it, put it in a top loader, and leave it alone. When you need to handle the card for inspection or photography, wear cotton gloves or hold it strictly by the edges.
Mistake #2: Using Dirty or Worn Sleeves
Frequency: Very common
Grade impact: 0.5-1.5 points
Old penny sleeves accumulate dust and grit inside them. Sliding a card into a dirty sleeve is like running it through fine sandpaper. The grit inside the sleeve creates micro-scratches across the card surface as the card slides in and out.
How to avoid it: Always use fresh, brand-new sleeves for cards you plan to grade. A pack of 100 penny sleeves costs about $3. There is no excuse for using old sleeves on a card you are about to spend $25-$50 grading.
Mistake #3: Poor Storage Between Pull and Submission
Frequency: Common
Grade impact: 1-3 points
Cards stored loose in a tin, rubber-banded together, or stacked without sleeves will develop edge wear and surface scratches. Even cards sitting in a binder can get damaged if the binder pages are low quality or overstuffed. Sunlight exposure fades card colors over time.
How to avoid it: The safest storage for cards awaiting grading: penny sleeve, into a card saver or top loader, stored upright in a box. Keep them away from direct sunlight, heat sources, and humidity. A cool, dark closet is ideal.
Mistake #4: Cleaning Cards Incorrectly
Frequency: Common
Grade impact: 1-3 points (can be catastrophic)
Some collectors try to "clean" cards before submission. This almost always makes things worse. Water damages cards. Solvents strip coatings. Rubbing with cloth creates micro-scratches. Compressed air can bend cards. Even microfiber cloths can cause fine scratches if the card has any grit on the surface.
How to avoid it: If a card has a bit of dust, a single gentle pass with a clean microfiber cloth is the absolute most you should do. If it has actual grime or residue, accept it and submit as-is. The graders have seen everything. Do not try to fix it yourself.
Mistake #5: Skipping the Centering Check
Frequency: Very common
Grade impact: 1-3 points
Centering is the single most common reason raw NM cards grade out at PSA 9 instead of PSA 10. Collectors eyeball their cards, think "looks centered," and submit. Then the card comes back as a 9 because the centering was 62/38, just outside the 60/40 PSA 10 threshold.
How to avoid it: Always measure centering before submitting. Use a ruler with millimeter markings, a digital caliper, or an AI centering tool like GradePokemon. If your centering is worse than 60/40 on any axis, you know the card is capped at PSA 9. Decide whether a PSA 9 justifies the grading cost.
Mistake #6: Submitting in Top Loaders
Frequency: Common among first-time submitters
Grade impact: 0 points (but costs you money)
Graders charge extra to remove cards from top loaders. PSA, CGC, and BGS all specifically request that cards be submitted in semi-rigid card savers (Card Saver I for PSA), not top loaders. The extra fee is not huge, but it is avoidable.
How to avoid it: Use Card Saver I or equivalent semi-rigid holders for grading submissions. The card goes in a penny sleeve first, then into the card saver. This two-layer method is the industry standard.
Mistake #7: Ignoring Factory Defects
Frequency: Common
Grade impact: 0.5-2 points
Not all damage happens after a card leaves the pack. Print lines, ink spots, off-center cuts, and roller marks are factory defects that came with the card. Graders do not care whether damage happened at the factory or in your collection. A flaw is a flaw.
How to avoid it: Before submitting, inspect your card under angled light for print lines and ink spots. Check for roller marks on holo cards. If you find factory defects, factor them into your grading decision. A card with a visible print line will not grade PSA 10 regardless of how well you protect it.
Mistake #8: Bending Cards During Packaging
Frequency: Occasional
Grade impact: 1-3 points (creases are devastating)
Shoving a top loader into an envelope that is too small, or packing cards too tightly, can create bends or pressure marks. These show up during grading even if the card looks flat when you take it out. Even a slight bend can create a crease line that drops a card to PSA 5-6.
How to avoid it: Use appropriately sized packaging. A cardboard sandwich (two pieces of cardboard with the card savers between) inside a rigid mailer is the standard. Fill empty space with bubble wrap so nothing shifts. Do not over-tighten anything.
Mistake #9: Under-Declaring Card Value
Frequency: Common
Grade impact: 0 points (but costs you money and time)
Declaring a lower value to save on grading fees is a bad idea. PSA reviews declared values during grading. If they determine a card's market value exceeds your tier's limit, they will move it to the appropriate tier and charge you the difference. You also get an unexpected charge and a processing delay.
How to avoid it: Declare the accurate market value of your card. Look up recent sold listings on eBay for your card in ungraded condition. Use that as your declared value. The few dollars you save by under-declaring are not worth the risk of upcharges and delays.
Mistake #10: Submitting During Major Release Weeks
Frequency: Occasional
Grade impact: 0 points (but adds weeks to turnaround)
Volume spikes at grading companies when major sets release. Everyone submits their new pulls at the same time. This adds weeks to every tier. If you are not in a rush, wait two months past a hot drop to submit.
How to avoid it: Check release calendars. If a popular set just dropped, hold your submission for 4-8 weeks. The grading companies' backlogs spike immediately after major releases.
Mistake #11: Not Checking the Back of the Card
Frequency: Very common
Grade impact: 0.5-2 points
Many collectors only inspect the front of their cards. But professional graders evaluate both sides. Back defects, particularly edge whitening on the blue border, are extremely common and can drop a card from PSA 10 to PSA 8.
How to avoid it: Always inspect the back of your card with the same rigor as the front. Check back corners for whitening, back edges for chipping, and back surface for scratches. If the back has significant wear, the front condition does not matter.
Mistake #12: Exposing Cards to Sunlight
Frequency: Occasional
Grade impact: 1-3 points (fading is permanent)
UV light fades card colors over time. Even a few weeks of sitting near a window can cause noticeable fading on certain cards. This is especially relevant for Japanese cards, which seem to fade slightly faster than English prints.
How to avoid it: Store your grading candidates in a dark, cool place. Never display raw cards in direct sunlight. If you want to display cards, use UV-protective sleeves or cases.
Mistake #13: Submitting Low-Value Cards
Frequency: Common among new collectors
Grade impact: 0 points (but wastes money)
Below approximately $75 raw value, the grading fee plus shipping plus grading-risk discount usually eats any potential upside. A $15 raw holo rare costs $48+ after grading and shipping. If the PSA 10 value is only $30, you have lost money even with a perfect grade.
How to avoid it: Run the break-even math before paying the fee. Rule of thumb: the PSA 10 value should be at least 3x your all-in grading cost. Use free AI pre-grading to identify your best candidates and skip the rest.
Mistake #14: Not Using AI Pre-Grading
Frequency: Common
Grade impact: Preventable 1-3 point surprises
Over 70% of modern cards that collectors think are PSA 10 candidates come back as PSA 8 or 9. The top grade-killers are centering and surface scratches invisible to the naked eye. AI pre-grading catches these issues before you spend money.
How to avoid it: Run every card through GradePokemon's free AI grader before submitting. If the AI predicts PSA 8, do not submit hoping for a 10. The AI is probably right. Save your money for the cards the AI predicts at 9.5-10.
Mistake #15: Wrong Set Identification
Frequency: Occasional
Grade impact: 0 points (but causes delays and errors)
Pokemon has hundreds of sets, and card names repeat across them. A "Charizard ex" from Obsidian Flames is a completely different card from a "Charizard ex" from 151. PSA needs the exact set name and card number. Getting this wrong causes processing delays and can result in the wrong card being listed on the label.
How to avoid it: Confirm the exact set name and card number before submitting. Get this information from Bulbapedia or the set symbol printed on the card. Double-check your submission form before mailing.
Summary: Grade Impact by Mistake
| Mistake | Frequency | Typical Grade Impact | Preventable? |
|---|---|---|---|
| Touching card surface | Extremely common | 0.5-2 points | Yes — gloves + sleeves |
| Dirty sleeves | Very common | 0.5-1.5 points | Yes — fresh sleeves |
| Poor storage | Common | 1-3 points | Yes — proper storage |
| Cleaning cards | Common | 1-3 points | Yes — do not clean |
| Skipping centering check | Very common | 1-3 points | Yes — measure centering |
| Top loaders for submission | Common (newbies) | Extra fees | Yes — use card savers |
| Ignoring factory defects | Common | 0.5-2 points | No (but can avoid submitting) |
| Bending during packaging | Occasional | 1-3 points | Yes — proper packaging |
| Under-declaring value | Common | Upcharges + delays | Yes — declare accurately |
| Submitting during releases | Occasional | Weeks of delay | Yes — wait 4-8 weeks |
| Not checking back | Very common | 0.5-2 points | Yes — inspect both sides |
| Sunlight exposure | Occasional | 1-3 points (fading) | Yes — dark storage |
| Submitting low-value cards | Common | Wasted money | Yes — run the math |
| Not using AI pre-grading | Common | Preventable surprises | Yes — use GradePokemon |
| Wrong set identification | Occasional | Delays + label errors | Yes — verify set/number |
The Pre-Submission Checklist
Before you mail any card for grading, run through this checklist. Skipping any line is a common reason submissions come back at a grade lower than expected:
- Raw market price and PSA 9/10 prices pulled, with the spread documented
- Free AI grade estimate run, showing 9.0+ on the target grade
- Centering measured (ruler or AI tool) — within 55/45 on both axes for PSA 10 target
- Corners inspected under angled light with a loupe or macro lens — no whitening
- Edges checked under angled light — no chipping or whitening
- Surface inspected under raking light — no scratches, print lines, or holo wear
- Back inspected with same rigor as front — no edge whitening on blue border
- Factory defects checked — no print lines, ink spots, or roller marks
- Card in penny sleeve + semi-rigid (Card Saver I), NOT in a top loader
- Submission form filled out, declared value matches insurance, packing slip printed
- Correct set name and card number verified
- Shipping: cardboard sandwich + rigid mailer + tracking + insurance
- Both sides of every card photographed before sealing, just in case
How AI Pre-Grading Prevents the Most Common Mistakes
Several of the mistakes on this list can be caught by AI pre-grading before you spend money on a submission. Here is how GradePokemon helps:
| Mistake | How AI Pre-Grading Helps |
|---|---|
| Skipping centering check | AI measures centering automatically with sub-pixel precision |
| Ignoring factory defects | AI detects print lines and surface anomalies |
| Not checking back | Upload back photo for separate analysis |
| Submitting low-value cards | AI identifies card and shows market value alongside grade prediction |
| Unrealistic grade expectations | AI provides objective prediction, removing wishful thinking |
The Bottom Line on Grading Mistakes
Most grading disappointments are preventable. The cards that come back as PSA 7 when you expected a PSA 10 are usually not victims of bad luck or harsh grading. They are victims of common, avoidable mistakes: touching the surface, using dirty sleeves, skipping the centering check, not inspecting the back, or submitting without any pre-screening.
The collectors who consistently get high grades are not luckier than you. They are more careful. They sleeve immediately, inspect thoroughly, measure centering, check both sides, use AI pre-grading, and only submit cards that genuinely deserve a high grade. Follow their example and you will see your grading success rate improve dramatically.
Ready to avoid these mistakes? Pre-grade your cards for free with GradePokemon before you spend a dime on professional grading. Free credits available, no credit card required.