Heatran: Being the most consistent Stealth rock setter tied with Hippowdon, and without a doubt the best in the balanced archetype with Clefable is not so little. Although, his specially defensive set is not as strong as once, but he can still rely on other sets like the Fast stealth rock setter with taunt/toxic, Lava plume and earth power which i believe to be the most effective Heatran set at the moment. A fast lure set which relies on Magma storm, toxic, taunt and earth power. Used to fool the opponent that heatran is scarf as they see you have another stealth rock setter. The scarf, which i consider more effective in late game or for revenge killing, that relies into an absurdly powerful Fire stab that does more than that DPP LO Nape’s Fire Blast that some of you may have seen in action. The air baloon set which gives one free turn to set rocks, toxic, or even taunt against instant-threat Earthquake users like Lando-T, Mega Altaria or Char-X, or against non-dangerous but harder to deal with, like Hippowdon or Garchomp. Uses the same stats as the fast setter’s but with Fire Blast instead, used usually to get more guaranteed or occasional 2hkoes. Then there’s the occasional lure set with Power Herb used usually to prevent most OU water types to gain momentum (Example: Manaphy switching and going with tail glow or Rotom-w’s Hydro Pump/Volt switch mindgames). He is one of the most evs customizable mons in ou thanks to rare balanced stats which gives him strong natural bulk, not bad speed, and a great special attack. Heatran is without a doubt the mon that reflects the A+ rank perfectly and i’d really like to know why you come with such an idea, because dropping him is madness.
Weavile: His main problem is without a doubt the longevity, and that it can’t do his job alone. It is obligatory to have some mons that deals with his checks/counters or weavile will be trash, as forcing weavile to switch is one of the worst things that can happen to him with these hazards that aggravates his longevity problem, and his checks are not that few. It has zero defensive utility seeing that defensive stats and especially that typing, so it is really difficult to find an occasion to switch into someone without a high risk of being attacked and KOed or severely weakened, making him useless or almost, if it happens. I feel that A+ is too much, it is fine where it is.
Mega Alakazam: It has problems of longevity and bulk like weavile, but a bit less. I feel the most weighty of Mega Kazam’s problem is the mega slot opportunity cost, but it’s fine if you have an urgent need to outspeed all non-scarfed mons in the tier that you cannot outspeed with LO Kazam. Other problems comes also from the loss of magic guard, but that’s luckily compensated by Trace, which helps Mega Alakazam to show his utility in another way. Tracing various abilities like, for example: the speed boosting abilities, Regenerator, Lightingrod, Sheer force, even Magic Bounce, can literally capsize the fate of a battle. Being able to 2hko always or sometimes a lot of stuff with that strong Psychic STAB and Mega Sableye with Dazzling gleam also restricts his switchin list. A rank is perfect in my opinion.