Cacnea

Cacnea is a truly amazing Pokemon with sandstorm set up, thanks to its ability, Sand Veil. It's the only Pokemon in Little Cup that is immune to the effects of sandstorm that isn't a Rock-, Ground-, or Steel-type and isn't named Cleffa. Not only that, but Cacnea can become one of the most threatening Swords Dance sweepers in LC, as it boasts the strongest priority move in the game (tying with Extreme Speed), Sucker Punch, and has a solid movepool to back it up. Unfortunately, that's where the praise is cut short. Cacnea is really hindered by its low Speed and frail defenses. What really hurts it is not sharing a Dark-type to have a STAB Sucker Punch, unlike its evolution, Cacturne. Aside from this, its ability is only useful if it is used on the same team as Hippopotas, meaning you're forced to use up a team slot to take advantage of it.

Through it all, Cacnea still comes out as a worthwhile Pokemon, and is a potent threat, with a good helping of prediction and a side of luck. Consider using it if you need a good Grass-type with priority and already have sleep support on a teammate, or if you are using Hippopotas. If you don't already have sleep support on a teammate, Cacnea's role is somewhat challenged by Bellsprout, who has slightly less power, but has access to the ever useful Sleep Powder. They do have separate abilities and typing that set them apart, however. All in all, Cacnea is a solid Grass-type Pokemon who can pull off a few interesting roles.