You'll get it after you beat the game.
In solar cave
solar cave
I believe it is in Solar Cave...
No, it's only in blue & red rescue team.
in blue rescue team you are a pokemon, so you cant catch pokemon, you are friends with them.
after defeating rayquaza, it should come up later on
In solar cave (with key) or wyvern hill (with key)
with a moon stone u can find one in solar cave
how do you evolve golbat in pokemon blue rescue team
No. Pidgey is unobtainable in Pokemon Mystery Dungeon Blue Rescue Team.
You can't. Pokemon Blue Rescue Team only has Pokemon from Kanto, Jotoh, and Hoenn. Piplup is from Sinnoh which was discovered after Blue Rescue Team to come out, so you can get Explorers of Time or Darkness if you want Pokemon from Sinnoh.
After you beat Rayquaza, the next day it comes!