As you can see, the card's rules were changed before October 1996 when Base Set released
3 cards had to be removed due to a max of 25 poll options
The ability isnt targeted, so the choice isnt made until spell resolution, at which time its too late to respond
The box also includes 45 Energy cards, so you can power up your Pokmon right out of the gate
Greninja does not have an Ability but it does have two moves
C Common Favorite Contact X TRAP Special Summon 1 Fusion Monster from your Extra Deck that mentions a "HERO" monster as material, ignoring its Summoning conditions, by placing the Fusion Materials mentioned on it on the bottom of the Deck in any order, from among cards in your hand, field, GY, and/or your banished cards