Pikachu doesn't evolve by level, you have to evolve him with a thunderstone.
Both at level 30
After you evolve in Pokemon Mystery Dungeon, you should train to level 100 then kick other pokemon's ASSES
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.
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.
After you evolve in Pokemon Mystery Dungeon, you should train to level 100 then kick other pokemon's ASSES
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.
Pineco will be able to evolve at Level 31.
It evolves at Level 35!
Marshtomp will be able to evolve at Level 36.
Absol doesn't evolve.
You can evolve Pikachu into Raichu as soon as you have unlocked Luminous Spring and graduated from the guild however if Pikachu is your starter or your partner then you must finish all of the dungeons up to Spacial Rift and then go back to Spacial Rift and recruit Palkia then you can go back to Luminous Spring then you'll have the ability to evolve any of your Pokémon including your Pikachu however a requirement for Pikachu's evolution is that you need a Thunder Stone to be in your bag or in storage.
it should evolve at level 36. hope this helps:)
I believe level 18