POKEMON CARD JEOPARDY 2, ROUND 2

Series

200

This series introduced GX cards to the TCG.

Sun and Moon

400

This series introduced Level X cards to the TCG.

Diamond and Pearl

500

This series features a Type of Card that does not have a rarity, is EXCLUSIVE to promo cards, and was playable in the TCG. 

Sword and Shield 

800

This series features the most Black Star Promo Cards.

Sword and Shield (307)

1000

This series features the most Holiday sets.

Scarlet and Violet (6)

1200

This series has the most expensive non-WOTC promo card in a PSA 10. (via pricecharting.com)

Diamond and Pearl, Infernape Level X, $33,580 in a PSA 10.

(https://www.pricecharting.com/game/pokemon-promo/infernape-lvx-dp10#completed-auctions-manual-only)

Eras (Vintage, Mid, Modern)

200

This era is the common grail of most collectors, because it is timely and precious. 

Vintage

400

This era features the most sets.

Mid (60)

500

This era features the most Rarities. 

Modern (14)

800

This era is the most expensive. 

Vintage

1000

The first World Championship of the Pokémon Card Game (Internationally) was held during this era. 

Vintage

1200

This era debuted fully illustrated cards. 

Mid (Specifically, HeartGold/SoulSilver, being Legend Cards.)