Thunder has 100% accuracy in rain.

Earthquake hits through Dig.

Gust hits through Fly.

Flame Wheel can defrost you.

Headbutting trees at night will reveal sleeping Pokémon.

Slowking does not evolve from Slowbro.

Scyther is the coolest Pokémon.
Kabutops is ancient Scyther.
Genesect is future Scyther.

Oshawott and Piplup are the cutest Pokémon.
Rhydon, Machamp and Onix are the toughest.

Chingling is the most forgettable Pokémon, followed by Chatot (honourable mentions to Sunflora, Corsola, Elgyem, Skiploom).

Pokémon Crystal is the best game.