Pokemon Did You Knows?

[Moriatti]

Tauros is the fastest normal type IIRC, and has a pretty good attack. Which means he's the fastest Hyper Beam. If you are playing on the cart and not Pokémon Stadium, you don't recharge if you KO the target. Hyper Beam also has a base power of 150 and halves the targets defense. Factor in the STAB Tauros is receiving and....

EDIT: I also recall that Tauros can learn Earthquake and Swords Dance, which means that the only Pokémon that resisted Hyper Beam (rock and ghost) were weak to the only other move you would need. (Recall Gengar's line is also Poison Type and that there is no levitate at this point.)

SECOND EDIT: This also continues Ash's tradition of catching INCREDIBLY good Pokémon (Tauros, Snorlax, Heracross) and using them rarely even if at all.