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