M6a 30th Celebration's median big card lost 39% in four weeks after launch week
Mewtwo ex 134/103 dropped from $92.60 to $28.30. Only Charizard, the most expensive card in the set, ended higher.
M6a: MEGA Expansion 30th Celebration came out in Japan on September 16, 2026. We leave out its first 14 days, which ended September 30, because launch prices are set before boxes are opened at scale. From September 30 to October 28, 19 of the 20 cards worth $20 or more got cheaper, and the median card lost 38.6%.
The set fell far faster than a typical new set
Our study of 76 sets from 18 games, covering 1,694 cards worth $20 or more, shows what usually happens. As of October 25, 30 days after launch week, the typical card in those sets was down 11.5%, and 78% of the cards were cheaper. In M6a, 95% of the big cards are cheaper, and 16 of the 20 moved by 20% or more.
The one exception is Charizard, the most expensive card in the set. It rose 2.5%, from $190.00 to $194.79. That is the biggest gain of all cards.
Mewtwo ex 134/103 lost 69%
Mewtwo ex - 134/103 had the biggest drop of all cards. It went from $92.60 to $28.30, a loss of $64.30 or 69.4%. Its first market price after release, on September 23, was $102.11, so the drop since then is 72.3%. Its price changed 19 times in the last 30 days.
Three more cards lost more than half of their launch week price. Sylveon ex - 130/103 fell 58.7%, from $63.75 to $26.32. Mew ex - 135/103 is down 53.4%, from $130.56 to $60.87. Pikachu ex - 126/103 lost 51.6%, ending at $47.70.
The five priciest cards held up better
The five most expensive cards lost a median of 28.3%. The rest of the set lost 44.0%. Lugia - 142/103 slipped 12.1%, to $175.30. Magikarp lost 28.3%, ending at $73.90.
Below them the drops were steeper. Pikachu ex - 127/103 lost 44.0%, and its first price after release was $139.00 against $55.35 now.
The ten most expensive cards
Pikachu & Zekrom GX is the only card in the table that trades rarely. Its price changed just 7 times in 30 days, so its 10.0% drop is rough.
| Card | Sep 30 | Oct 28 | Change |
|---|---|---|---|
| Charizard | $190.00 | $194.79 | +2.5% |
| Lugia - 142/103 | $199.51 | $175.30 | −12.1% |
| Magikarp | $103.06 | $73.90 | −28.3% |
| Mew ex - 129/103 | $106.07 | $68.88 | −35.1% |
| Mew ex - 135/103 | $130.56 | $60.87 | −53.4% |
| Pikachu - 136/103 | $98.63 | $57.82 | −41.4% |
| Pikachu ex - 127/103 | $98.82 | $55.35 | −44.0% |
| Gengar (Prime) | $77.02 | $50.07 | −35.0% |
| Pikachu ex - 126/103 | $98.62 | $47.70 | −51.6% |
| Pikachu & Zekrom GX | $50.87 | $45.80 | −10.0% |
A wider drop than the usual first month
A median loss of 38.6% sits far from the 11.5% typical for new sets, and the losses reach nearly every card, not only the chase cards. Charizard is the only big card that ended the window higher. Every card and its full price history is on the M6a: MEGA Expansion 30th Celebration page.