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Going with a Canada theme.
Grass is a moose calf. Final evo is a Grass/Rock Moose of strong stature with antlers/hooves made of rock. And moss hanging over body / antlers. Would be high attack/def stat with decent speed, and low special attack. Would use Horn Leech over Giga drain etc. Access to High Horsepower, Head Smash. Solid Rock Hidden ability. Signature move would be Battering Strike. Grass attack that does decent damage. 1/4 the damage is done to a random enemy party member, even if they are currently not in combat. (it can be resisted but the additional enemy does not take super effective damage) (I think this mechanic is cool and unique to get some chip damage on the enemy teams other mons but also might be overturned. Then again, the grass typing is also a factor. Could Nerf)
Fire would be a bunny. Final evo would be a wolpertinger or a jackelope and be Fire/Fairy type with horns made of fire. Would be the fastest with great sp. attack and decent attack and have low defenses. Would have Fluffy as a Hidden Ability. Would cancel out since its Fire type, but also help it out a little with its poor defenses. Might be OP, unsure. Would learn Fire Blast, Moonblast, Hyper Voice. Signature move would be Bloodmoon Gore. Dualtype Fire/Fairy special attack move that looks physical that lowers special defense of target.
Water would be a Platypus. Water/Poison type. Bulky mixed attacker, lowest speed of the three, but still decent. It would have Merciless as Hidden ability. Signature move would be Acidic Swipe. Water attack with a 30% chance to poison target for signature move. Can hit two targets in doubles.