It´s Gengar, it evolves from haunter (evolution of gastly) by trading.
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to get number 71 (gengar) you havre to catch a haunter in the top right corner of veilstone city-galactic HQ and get it to evolve
gengar
It depends what you mean by cool. However, it learns leaf blade at level 71 and last resort at level 50. Which are the strongest moves. It can also learn many tms. and I think it can learn cut. It can also learn grasswhistle, which puts the opponet asleep, at level 57. Here, this link might help. If it doesn't work, then look up the complete sinnoh dex and go to Pokemon marriland. look up leafeon. http://Pokemon.marriland.com/diamond_pearl/pokedex/Leafeon/.leafeon can not learn cut in platinum though
At Level 71, Feraligatr learns Hydro Pump. I would strongly recommend it for your Pokemon, as it is a strong and powerful move and exceptionally devasting against Fire-types.
The following Pokemon learn it by leveling up: Ponyta (lv 53), Rapidash (lv 63), Entei (lv 71). The TM (TM38) is given by Blaine, the gym leader on Cinnabar Island, as a reward for defeating him.