Wailord needs entry hazards set up on the opponent's side of the field to be effective, as foes can switch around without much trouble otherwise, limiting its PP stalling abilities. Don't be afraid to use Wailord's natural bulk to switch in on threats it can wall, such as Torkoal.
A pony is not a small horse. Horses and ponies are genetically two different species. There are horse-sized ponies, and pony-sized horses, but the genetics are what tells them apart, not the size. A miniature horse, for example, is very small and looks like a pony, but genetically, it is a horse.
This FEI has realised this fraudulous tampering with the rules and banned it. The FEI's definition of a pony still is, a small horse whose height at the withers, having been measured on a smooth level surface, does not exceed 148 cm without shoes or 149 cm with shoes.. Pony Measurement. All ponies competing at the CH- EU-P will be measured on site before starting the competition.