Illustrator

Yusuke Kozaki

Yusuke Kozaki has illustrated 4 cards with a current market price, across 2 sets. The most valuable is Professor's Research [Professor Willow] (Secret) from Pokemon GO at $9.15.

Priced cards4

Total value$13

Median card$1.52

Top-5 average$3

Professor's Research [Professor Willow] (Secret) alone is worth more than the other 3 cards put together. Nothing in the top 4 comes from the last two years; the newest is from 2022.

Most valuable

Professor's Research [Professor Willow] (Secret)

Pokemon GO

$9.15

Professor's Research [Professor Willow] (Full Art)

Pokemon GO

$2.44

Professor's Research [Professor Willow] (with Pokemon Go Code)

SWSH: Sword & Shield Promo Cards

$0.60

Professor's Research [Professor Willow]

SWSH: Sword & Shield Promo Cards

$0.38

The 4 most valuable, ranked

#	Card	Set	Rarity	Price
1	Professor's Research [Professor Willow] (Secret)	Pokemon GO	Secret Rare TIER 5	$9.15
2	Professor's Research [Professor Willow] (Full Art)	Pokemon GO	Ultra Rare TIER 4	$2.44
3	Professor's Research [Professor Willow] (with Pokemon Go Code)	SWSH: Sword & Shield Promo Cards	Promo	$0.60
4	Professor's Research [Professor Willow]	SWSH: Sword & Shield Promo Cards	Promo	$0.38

Where the value sits

Share of total value by rarity tier

TIER 5

73%

TIER 4

19%

Top sets

By total value of this entity's cards

Pokemon GO

$12

SWSH: Sword & Shield Promo Cards

All cards

Click a heading to sort. Filter by set, rarity, tier or minimum price.

Min price $

Card	Set	Rarity	Price
Professor's Research [Professor Willow] (Secret)	Pokemon GO	Secret Rare TIER 5	$9.15
Professor's Research [Professor Willow] (Full Art)	Pokemon GO	Ultra Rare TIER 4	$2.44
Professor's Research [Professor Willow] (with Pokemon Go Code)	SWSH: Sword & Shield Promo Cards	Promo	$0.60
Professor's Research [Professor Willow]	SWSH: Sword & Shield Promo Cards	Promo	$0.38

Figures are market prices for raw, ungraded Near Mint singles, updated daily from 2026-09-25. Generated from price data, not financial advice.