It evolves at level 20.
At level 20 Patrat will evolve into Watchog
Patrat evolves at level 20.
Patrat evolves at level 20.
Patrat will evolve into Watchog when it reaches level 20
Patrat evolves into Watchog at level 20.
Patrat evolves at level 20 into a Watchog
level 20
20.
It evolves at level 20 into Watchog.
Patrat evolves into watchog at level 20, watchog does not evolve though.
Well, Watchog doesn't evolve but if your talking about Patrat then at level 20.
lv. 20