What CP? It's best role is to prestige vaporeon and rhydon. I guess you could max one out as an attacker. Very good moveset.
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Whether or not to invest in him is more dependent on your need, resources, and options.
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What's the current CP? As others have suggested it may be better for prestiging details, but definitely works as an attacker if you do not have any other grass options already.
Also arguably the best pure grass, along with Tangela.
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That is a great attacker so yes power him up and for prestiging you want VW/PB because PB has a much lower CD allowing you to dodge easier but as an attacker that is the best along with RL/SoB.
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Mine has razor leaf but at 1300 cp he can easily take down 2800 Rhydons. Don't power him up too much!