I'd like to ask what exactly is wrong with Mega Houndoom? It's very much an underrated threat in the meta with a lot of late-game cleaning potential, which funnily enough, I see the same thing happening with Raichu.252 SpA Life Orb Starmie Psyshock vs. 0 HP / 0 Def Raichu: 230-270 (88.1 - 103.4%) -- guaranteed OHKO after Stealth Rock
Now that stinks. If Raichu's bulk is really that bad, I don't know how many setup opportunities you can grab.
With Lightning Rod, you could technically set up off Electric types like Rotom-W and choiced Magnezone, but nothing else, seeing as you only have one resistance/immunity and seriously crappy bulk.
252 SpA Magnezone Flash Cannon vs. 0 HP / 4 SpD Raichu: 78-93 (29.8 - 35.6%) <---- Magnezone 3HKOes after Life Orb recoil.
0 SpA Rotom-W Hydro Pump vs. 0 HP / 4 SpD Raichu: 148-175 (56.7 - 67%) -- guaranteed 2HKO <---good luck setting up now :I
0 Atk Ferrothorn Gyro Ball (150 BP) vs. 0 HP / 0 Def Raichu: 123-146 (47.1 - 55.9%) -- 78.5% chance to 2HKO <--what is this? Ferro getting the 2HKO on Raichu?
If freaking Ferrothorn and Rotom-W can cleanly 2HKO this thing, and Talon/Mega Lopunny/Serperior can safely revenge kill it...
...I'm sorry, I don't see much OU potential for it. Seems like our friend Raichu will go the way of Mega Houndoom.
Sure it can't set up on a ton of shit without getting hurt, but look at your calcs -- two and three hit KOs all around. Like Houndoominite, Sharpedonite etc., if it's in a late-game situation where priority and faster 'mon are down, it can get up a set-up opportunity and proceed to clean. Tail Glow immediately makes it very threatening, and with a very good speed tier I fail to see what makes it particularly bad. Admittedly it might not be as impressive as some of the others on this slate, but it's still a very good and fun buff. Hell, I can't remember if we've had any late-game cleaners on the theorymon project recently - correct me if I'm wrong on this - so seeing something with that role is really fun. This honestly might get my vote.