Pidgeotto evolves into Pidgeot at level 36.
Corsola does not evolve
Ampharos does not evolve in Pokémon HeartGold.
level 30
level 32
level 25
Level 20
Level 21.
Level 33.
Level 22
level 32
Get it to level 20, and it should evolve.
Kangaskan cannot evolve.