It is Mukrow you can get him by hitting a tree outside of the RIGHT entrance to rasp cavern on Renbow island, I think you need 1 or 2 Tackle to do it might pay to check. Hope this helps!
The Pokemon that evolve at level 55 are as follows:Dragonair evolves into Dragonite.Pupitar evolves into Tyranitar.dragonair and pupitar
Head to seven island and rematch the Pokemon rangers in the south also if you continue south another Pokemon ranger is there each ranger has all grass type Pokemon use flamethrower with moltres to easily win, also if you have it hold lucky egg when your training it it will level up faster, you can also rematch the cool couple in sevault canyon and the tamer and the battle girl don't verse the girl Pokemon ranger. Before you know it moltres will be level 80.
Tyranitar is a shadow pokemon, and it's level 55.
ish up yo bum around the corner into your intestines up out through yo mouth if you want to get it you need to get one friend to stick their hand up yo bum and another in yo mouth try it its quite easy
Pupitar evolves at Lv 55.
55
at level 55
level 55
At level 55
Level 55
lv 55
lv 55