You can't. You need its pre-evolution the Pokemon called Tyrogue. He can evolve into Hitmonlee, Hitmonchan or Hitmontop; depending on his upbringing.
Hitmonlee cannot evolve any further, nor does it have a Mega Evolution form.
The is no pre-evolution of onixOnix is a stage 1 pokemon
tyrogue, which is the pre-evolved form of hitmonlee hitmonchan and hitmontop
I'm sure you mean 'Hitmonchan' and to answer your question is an impossibility. Hitmonlee does NOT evolve into a Hitmonchan. They're two differently categorized Pokemon that just happen to be placed right next to each other in number, but they have no connection for evolution.
Azurill
Chingling
Torterra does not evolve.
No, not every Pokemon is able to evolve. Some Pokemon have only a single form, meaning that it does not have a pre-evolution or evolution. Legendary Pokemon are most prevalent in this aspect - none of them have a pre-evolution or evolution.
. well in these four generation of Pokemon , tropius doint have any evolution or pre evolution ... but who knows...maby in later generations there could be one pre evoution or evolution for tropius. i expect that these helped you! :).
Onix does not have a pre-evolution. It does, however, have an evolution - Steelix, which you can evolve it into by trading it while holding a Metal Coat.
Yes, it is Pikachu's only evolution, though Pikachu has a pre-evolution, Pichu.