Pidgeotto evolves at level 16. He evolves from a Pidgey. Pidgey can be caught almost anywhere in the beginning of the game. Pidgeotto evoles into a Pidgeot at level 36.
Pigeotto evolves at level 36.
Pidgeotto (sometimes wrongly spelled as Pigeoto) is a flying type of Pokemon. It will evolve if you can raise it to level 36.
Wooper will evolve at Level 20.
Farfetch'd is a Pokemon that does not evolve.
level 55
at level 38
at level 32
level 32
about level 16
Level 25 .
hitmonchan cant evolve
Farfetch'd does not evolve in Pokemon HeartGold. Sorry! :)