How do you evovle Pikachu on HeartGold?

Vaporeon - Good water type, except for the low speed. Use Water Stone.

Jolteon - Awesome electric type! Use a Thunderstone, and get a Thunderbolt TM from the game corner to make it more awesome.

Flareon - Eh, not too bad fire type (Teach it Earthquake!). Use a Fire Stone.

Espeon - Awesome psychic type! Level Eevee up with maxiumum friendship in the daytime.

Umbreon - SERIOUSLY COOL DARK TYPE. Level Eevee up with maximum friendship in the nighttime.

Leafeon - Good grass type (No special attacks, please.). Trade Eevee to Diamond/Pearl/Platinum and level up in the Eterna Forest.

Glaceon - Good ice type, except for the low speed and unnessaserily high defence. Trade Eevee to Diamond/Pearl/Platinum and level up in Route.217.