It appears randomly (on any floor) and you must have the music box that you get from defeating the 3 Regis.
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it is just the last floor if you how the music box that is the last floor to freind mew
you can find him in floor 33 and up and holding the music box in the bag --actually you find him through the floors 36-98 and the leader must have the music box, good luck!
how to recruit mew -go to relic ruins ( i think) by talking to shiftry after beating rayquaza - get all three regi parts ( on 15 bf, 25 bf, and 35bf) -after you beat registeal on 35 bf, you will get a "music box" - do not use the item or it will break. -wander around the 99 floor dungeon (relic ruins is 99 floors) until you see in the message screen about mew doing something. walk around the dungeon and start killing (mew can appear anywhere from 35bf - 99bf, but it should appear on every floor as well, so you can just walk the entire floor, but that kills your belly and mew sometimes is not on a floor) -make sure you have a friend bow or something-mew doesnt have that high of a recruit chance, and comes with his own friend area
Try to beat all of the 99 floors, recruit the regie's, or try to recruit mew. Good luck! note:the regis along with mew have about a 5% chance of recruitment so you may have to try a multiple number of times again good luck!
u can get him at the berred relic