It doesn't.
Rattata evolves to Raticate at level 20.
Raticate is the last evolved form of Rattata, evolving from level 20.
It will evolve at level 20.
It evolves at level 20 into Raticate and does not evolve again.
Rattata evolves into Raticate at level 20.Rattata evolves into a Raticate at level 20.
Rattata evolves into a Raticate at level 20.
Sadly..... Raticate does not evolve.
Unfortunately Raticate is the last in the Rattata family. I know how you feel. We all long for an evolution of Raticate sometimes ;P
Raticate can not evolve, it is a fully evolved pokemon.
raticate
Raticate is the last evolved form of Rattata, evolving from level 20.
It will evolve at level 20.
It evolves at level 20 into Raticate and does not evolve again.
Raticate at level 20
Rattata evolves into Raticate at level 20.Rattata evolves into a Raticate at level 20.
Rattata evolves into raticate on level 20
Raticate does not evolve into Sentret. Sentret is of a completely different evolution line, being the pre-evolution of Furret.
i evolved it in level 10, if you beat the 1st gym leader go talk to pro. elm and he is going to tell you how well you raised your starter Pokemon and he gives you early life to evolve any pkoemon.