Is there a Pokémon that evolve 3 times?
To date, no Pokémon whose pre-evolution has a branched evolution also has a branched evolution; Wurmple is the only Pokémon with a branched evolution whose evolutions can evolve again.
What are the four trade evolve Pokémon?
Pokémon evolutions by trading
The classic four evolutions (Alakazam, Machoke, Graveler and Gengar) from Red/Blue/Yellow evolve only by trading, while most Pokémon from later generations require an item to be held in addition.