Hippowdon, Alakazam 4, Tangrowth, Gengar, Absol G.
Hippowdon because it can mess up long games.
Alakazam 4 because it moves damage around in an SP deck(Nidoqueen SP decks too).
Tangrowth because it can heal with it's power and has an attack for {G} that has you attach as many discarded {G} energy to your pokemon, in any way, as you like.
Gengar for it's Level Down power(self-explanatory) and it's attack that does 30 to each of your opponent's pokemon that has any damage counters on it.
Absol G should be a prime concern because it, when played, has you flip 3 coins and for each heads your opponent sends a card from the top of their deck to the lost zone.
Note: these are from Platinum sets 2-4. I never said I wouldn't go to Advent of Arceus.
Hippowdon because it can mess up long games.
Alakazam 4 because it moves damage around in an SP deck(Nidoqueen SP decks too).
Tangrowth because it can heal with it's power and has an attack for {G} that has you attach as many discarded {G} energy to your pokemon, in any way, as you like.
Gengar for it's Level Down power(self-explanatory) and it's attack that does 30 to each of your opponent's pokemon that has any damage counters on it.
Absol G should be a prime concern because it, when played, has you flip 3 coins and for each heads your opponent sends a card from the top of their deck to the lost zone.
Note: these are from Platinum sets 2-4. I never said I wouldn't go to Advent of Arceus.