Two of everything
2x Magikarp 2x Gyarados ex (or 2x Gyarados) 2x Eevee 2x Vaporeon 2x Articuno ex 2x Misty 2x Sabrina 2x Leaf (or 2x X Speed) 2x Professors Research 2x Poke Ball This has changed with the introduction of Mythical Island's Vaporeon and it's Wash Out Ability, which lets you transfer Water-type Energy from your Benched Pokemon onto your Active Pokemon
Secondly, it gives a power boost, so you can kill out of nowhere faster or with a 9-power dork that doesn't have infect at all
I.e, if you know someone that has one, never ever play them
Brawl Legal Vintage Legal Timeless Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Legal Hanweir, the Writhing Township Legendary Creature Eldrazi Ooze Trample, haste Whenever Hanweir attacks, create two 3/2 colorless Eldrazi Horror creature tokens that are tapped and attacking
(This card is also still a Trap.) If this card is Special Summoned by this effect to a zone a Link Monster points to: You can add 1 "World Legacy" card from your Deck to your hand