As of the 4th generation, Tropius cannot evolve.
it doesnt evlove by level. you need to trade it and it will evlove for them, then they trade it back.
Level 36.
Level 25.
Level 28.
No pokemon evolves into tropius nor does tropius evolves into any pokemon.Hope it is helpful.
Level 20.
55
Level 18
level 33
level 40
Magikarp evolve at level 20.
level it up at night