What level can make Poliwag evovle on blue rescue team?

In Pokémon Mystery Dungeon: Blue Rescue Team, Poliwag evolves into Poliwhirl when it reaches level 25. You can also use a Water Stone to evolve Poliwag into Poliwhirl at any level. After that, Poliwhirl can further evolve into Poliwrath if exposed to a Water Stone as well.