Grass types have a good advantage over Water types in the beginning, then TM13 and TM14 come around and Grass types aren't that effective unless its a Pokemon with high speed and wide movepool.
Torterra is a perfect example; it can be KO'ed by Empoleon by Ice Beam or Blizzard if successful.
Fire is another problem. I once used Abomasnow and I faced an Octilery. The Octillery had a Focus Sash, and I was disappointed that Giga Drain didn't KO it. Unfortunately, Octillery also had Flamethrower.
Seriously Grass has many type combos that make it receive 4x damage from certain types.
Grass/Ice & Grass/Steel - Weak to Fire
Grass/Ground & Grass/Flying - Weak to Ice
Grass/Dark & Grass/Psychic - Weak to Bug
Grass/Fighting & Grass/Bug - Weak to Flying
However some types combos aren't as weak to certain types.
Grass/Rock - 2x damage from Bug and Steel.
Grass/Water - 2x damage from Bug, Poison, and Flying.
Grass/Fire would be a decent combo, because then it would only take 2x damage from Poison, Flying, and Rock. Give such a Pokemon good Speed and a Psychic and Rock attack and it can be have good resistance to commonly used Pokemon that have Stone Edge or Rock Slide (Machamp and Volcarona with Hurricane)
However, there would probably be another Pokemon to counter it. Also the ability a Grass/Fire Pokemon has may affect its performance in battles.
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