Time for another one of Reudh's Almost Never Used Pokemon specials!
Today, we have Wailord! The Float Whale pokemon, interesting for a number of reasons.
First off is its size: Wailord is the largest pokemon, standing at 47'07" tall, and weighing an incredibly light 877lbs (it is after all, basically a blimp + whale).
It has base stats that are quite interesting as well:
170/90/45/90/45/60
Look at that enormous 170 HP!!! That's crazy. Only four other pokemon, and one pokemon forme outdo Wailord in HP: those being Blissey (255), Chansey (250), Guzzlord (223), Zygarde-Complete (216), and Wobbuffet (190). Oh. Oh. 45 base defenses. That puts a very heavy damper on the 170 HP. No point in having titanic HP without defenses to match; while Blissey and Chansey lack Defense, they have quite good special defenses. Wobbuffet and Guzzlord aren't exactly defensive titans, but they're both better than 45/45 defenses. Zygarde-Complete might have much higher stats, but it only triggers at low HP, so it's not great either.
But Wailord. Wailord has nearly nothing it can do.
Unlike fellow blimp-inspired pokemon Drifblim, Wailord is just about useless. It has one and one only niche. It can PP stall. It has recovery, albeit limited in Leftovers and Aqua Ring. It can learn Protect, and it can learn Substitute (and with such high HP, it can form quite a few before needing to stop and heal up.) It gets Scald, but with a usually uninvested and unimpressive base 90 special attack, it's not going to be doing much but fishing (or whaling?) for a burn so it's slightly less pathetic on the physical side.
So, the only "viable" strategy with Wailord is the aforementioned Protect/Sub/Scald/Aqua Ring, which is almost entirely shut down by Taunt pokemon. Wailord can act as a win condition, but only if your entire team is a full stall team invested into helping Wailord survive. Wailord hates burns and poisoning, which prevent it from stalling effectively as its limited recovery is effectively nullified by burns and poisoning. Wailord demands Toxic Spikes, and the elimination of threats like anything with Boomburst or Infiltrator, as well as any grounded poison type that can absorb the toxic spikes it desperately needs to help stall out foes.
To go along with Wailord's only semi-viable option in PP stalling, it gets the abilities Water Veil (prevents burns), Oblivious (cannot be attracted), and Pressure (doubles PP usage). While Water Veil might be kind of useful, Pressure is the preferred option, because Wailord just hasn't got anything it can do besides PP stall, and if you remove effectively 50% of its ability to PP stall, then it's even more useless.
Oh, and even with support, Wailord gets shut down horribly by Rest pokemon, be they ChestoRest or RestTalk pokemon.
Poor Wailord.