Level 70.
on route 206 go left and get the poke ball and then you will have hydropump(this is not correct)
No.
To my knowledge Ludicolo does not learn Hydropump, however, Lombre learns hydropump at level 49.
Feraligatr
No, you can't.
level 42
Feraligatr is a Water type pokemon.
i think its 46
I pretty sure it is level 53.
Feraligatr cannot learn Sheer Cold.
if you use it often for many years.. yes.
Feraligatr learns crunch at level 32