How do you recruit castform in mystery dungeon?

first,you have to meet a spinda who wanted to meet the mirage pokemon.he passes that mission on to you.you have to beat entei,raikou,and suicune in the three fields(you can't recruit them until you've met the mirage pokemon).entei will turn the clear wing spinda gave you into a red wing,raikou turns it into sunset wing,and suicune turns it into the rainbow wing,giving you access to mt faraway.castform should be somewhere in the 26-29 floors.castform will be lv 50 and have a recruit rate of 7.4.