It evolves when it reaches Level 34.
A trainer on iron island has hippotas
hippotas is on iron island
in vellstone city
Have you seen a trainer with one? if so go to your pokedex search for the hippotas and go to "Area"
IT Evolvez in LV.34
you see it in vellstone city
in the Maniac Tunnel can you find them
In the elite 4
They are in the maniac tunnel.
You cant. You can only make hippodown pregnat.
You can ask friend for a hipodon mate it with a ditto