Grozard is another typical case of convergent evolution in Tandor. one thing to note though is that Tonemy gets a substantial change when evolves and becomes one of the most bizarre and top heavy Poison Types in the game. this annoying ball of fur and poison doesnt do much against Orchynx due to being inmune to its type attacks so its an easy catch and escape.
Tonemy is one of the first to appear when traversing the cave and its the equivalent of Zubat in this region.