Pikachu doesn't evolve by level, you have to evolve him with a thunderstone.
Pikachu evolves by a thunderstone
Both at level 30
In most Pokemon Mystery Dungeon games, you must clear the main plot of the game. You will then unlock a special evolution area, such as the Luminous Cave in Mystery Dungeon Red or Blue or the Luminous Springs in Mystery Dungeon Time, Darkness or Sky. To evolve Pikachu, you will need to have a Thunderstone in your possession. When asked if your Pokemon needs an item to evolve, say yes and select the Thunderstone. If you are trying to evolve your player or partner Pikachu in Mystery Dungeon Time, Darkness or Sky, you will also need to complete the post-credits plot and recruit Palkia for you to be able to evolve. You've got to get a Thunderstone and when Pikachu reaches a certain level, take it to the Luminous Spring while it is holding the Thunderstone and it appears on the list. Choose Pikachu, and it should evolve. I don't know where you get a Thunderstone.
After you evolve in Pokemon Mystery Dungeon, you should train to level 100 then kick other pokemon's ASSES
Poliwag evolves into poliwhirl at level 25.
It evolves at level 18 and not 16. If you are playing a Mystery Dungeon game, it will not evolve until post-game.
Both at level 30
All Pokemon evolve at the same level in Pokemon Mystery Dungeon as in the other games. As such, Treecko is able to evolve at level 16 in Mystery Dungeon. However, evolution is only unlocked when you get far enough in the story.
Get a high level.
In most Pokemon Mystery Dungeon games, you must clear the main plot of the game. You will then unlock a special evolution area, such as the Luminous Cave in Mystery Dungeon Red or Blue or the Luminous Springs in Mystery Dungeon Time, Darkness or Sky. To evolve Pikachu, you will need to have a Thunderstone in your possession. When asked if your Pokemon needs an item to evolve, say yes and select the Thunderstone. If you are trying to evolve your player or partner Pikachu in Mystery Dungeon Time, Darkness or Sky, you will also need to complete the post-credits plot and recruit Palkia for you to be able to evolve. You've got to get a Thunderstone and when Pikachu reaches a certain level, take it to the Luminous Spring while it is holding the Thunderstone and it appears on the list. Choose Pikachu, and it should evolve. I don't know where you get a Thunderstone.
After you evolve in Pokemon Mystery Dungeon, you should train to level 100 then kick other pokemon's ASSES
Pineco will be able to evolve at Level 31.
Marshtomp will be able to evolve at Level 36.
It evolves at Level 35!
Absol doesn't evolve.
it should evolve at level 36. hope this helps:)
I believe level 18
Poliwag evolves into poliwhirl at level 25.