Level 55.
Larvatar evolves at level 30. It takes a little while, but in the long run, can be well worth it. Larvatar will evolve into a Pupitar at that level. In addition, Pupitar will evolve into a Tyranitar at level 55.
no larvitar evolves through leveling up. level 30 for pupitar. and level 50 for tryanitar
lvl 30
One of the hardest to make evolve, Pupitar evolves at level 55.
you catch a lavatar at mount silver cave then at level thirty it evolves into pupitar. That's ONLY in Pokemon heart gold the one I said.
Wooper will evolve at Level 20.
level 31
On level 40
Farfetch'd is a Pokemon that does not evolve.
Level 55
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level 55