So Max / Max Bold Manaphy can take a +1 Outrage from LO Mence. That really isn't too big of a deal because, assuming that it runs Heart Swap, the set would look something like this:
Manaphy@Leftovers
Bold; 252 HP / 252 Def / 6 SpA
Surf
Rest
Rain Dance
Heart Swap
So even if you survive the Outrage and HS the speed boost, you are left with a single attack to sweep with. And that's if 236 SpA Surf is enough to pick off a weakened Mence / Nite / Gyara. Heart Swap's niche is much more likely to be found in double battles, where Manaphy can pass off its Acid Armors and Tail Glows to its partner.
Offensively speaking, Manaphy has no need to Heart Swap - it has access to the much more reliable CM / TG to boost its stats, and it definitely doesn't have the moveslots to fit yet another attack onto its set. Heart Swap...is gimmicky at best, and despite all claims of theorymon, some things are just common sense; this would be such an example, IMO.
Antique Roadshow used Heart Swap Manaphy on a stall team, and according to him it performed well. Antique Roadshow is a great battler, who cashed in a lot of wins for the champions Oceania in the World Cup of Pokemon. I'm assuming he used it as a cm sweeper check/end game sweeper. Perhaps he did use it to check mence, and ran ice beam. Maybe he ran a rest/rd or a sleeptalking set (both of which would run surf/heart swap).
I'm pretty sure that Heart swap has been fixed in any case, but considering that a great battler Antique Roadshow, and one of our best battlers Panamaxis has agreed that it works as well, I'm interested in testing it.



