Moves
Protect allows Mega Blaziken to safely get a Speed boost against faster threats like Mega Lopunny, Choice Specs Greninja, and Mega Gengar, and also can be used to scout the set the foe is using to see if setting up with Bulk Up or using Will-O-Wisp is better than attacking. Flare Blitz allows Mega Blaziken to take care of Steel- and Grass-types like Genesect, Ferrothorn, and Serperior. High Jump Kick enables it to combat Normal-, Rock-, and Dark-types such as Mega Lopunny, Porygon2, and Mega Tyranitar. Bulk Up allows Mega Blaziken to take care of bulky Pokemon like Mega Metagross, Porygon2, and Mega Sableye more easily. Will-O-Wisp enables it to beat Mega Metagross and Mega Mawile, as well as Sturdy users like Rockium Z Aggron and FEAR Pokemon like Aron, breaking their respective strategies. Substitute combined with Protect can be used to play mind games with foes that normally threaten to OHKO Mega Blaziken that have negative repercussions with their main STAB moves, and it can help deal with Zeraora and Naganadel. Thunder Punch can be run with Bulk Up to give Mega Blaziken the chance to beat Mega Gyarados, as most Gyarados will not Mega Evolve out of fear of High Jump Kick.
Set Details
252 HP EVs and 92 Special Defense EVs allow Mega Blaziken to be able to tank Mega Charizard X's Outrage, Mega Charizard Y's Air Slash, and Magearna's Twinkle Tackle. 140 Speed EVs allow Mega Blaziken to outspeed Mega Lopunny after one Speed boost. The rest of the EVs go into Attack to make Mega Blaziken able to beat maximum HP Mega Charizard X and bulky Mega Charizard Y. Using Blaze as base Blaziken's base ability allows it to not give Speed Boost to Trace users like Mega Gardevoir.
There are several additional ways to EV Mega Blaziken, all taking advantage of the difference in Speed gained through its ability. Running 252 Atk / 4 SpD / 252 Spe and an Adamant Nature will let Mega Blaziken outspeed and OHKO non-Timid Choice Scarf Porygon-Z, Haxorus, and bulky Mega Gardevoir after using Protect. However, running a more offensive spread will lose reliability against both Mega Charizards. Additionaly, either 252 HP / 64 Atk / 176 SpD / 16 Spe with a Jolly Nature or 252 HP / 24 Atk / 168 SpD / 64 Spe with a Careful nature can be run in order to increase Mega Blaziken's Special Defense in exchange for power and Speed. The former can outspeed Mega Gengar after Protect and tank Naganadel's Draco Meteor, avoiding the need to run Substitute, but will lose some reliability with Magearna without Substitute. The latter can be run to avoid mind games with Magnezone, tanking a Gigavolt Havoc, alongside improving the overall Meloetta matchup, but its further loss in Speed and power lets it lose to more niche threats, like Mega Gengar and Choice Scarf Diggersby, alongside the previously weak Magearna matchup. For more physically defensive spreads, a spread of 128 HP / 80 Atk / 236 Def / 64 Spe with an Adamant Nature allows Mega Blaziken to tank Haxorus after Protect and Bulk Up, and Fake Out into Gigavolt Havoc from physical Zeraora, but will specifically lose reliability against Mega Charizard Y. Finally, if you choose to run Will-O-Wisp, 192 HP / 48 Atk / 252 Def / 16 Spe and a Jolly Nature can be run to tank a Tectonic Rage into Sucker Punch from burnt Golem and a burnt Continental Crush from Crustle after Shell Smash, while naturally tanking threats like Mega Lopunny and outspeeding Mega Gengar after one turn, but will sacrifice matchups against with Mega Charizard Y, alongside Magearna and Naganadel.
Usage Tips
Mega Blaziken can be picked against either Mega Charizard Y or X. Use High Jump Kick on the first turn, as neither forme can OHKO Mega Blaziken. Against Mega Charizard X, use High Jump Kick again to finish it off. If Mega Charizard X uses Flame Charge against Mega Blaziken, use Protect the next turn, giving it another Speed boost and making sure it avoids being KOed by a faster Outrage before Mega Blaziken follows up with High Jump Kick. Be wary of offensive Dragon Dance Mega Charizard X variants, as they can potentially outplay Mega Blaziken if it boosts while Mega Blaziken uses Protect. However, against Mega Charizard Y, Flare Blitz will do more damage in the sun and cannot miss, so use it to take care of Mega Charizard Y. Against Magearna, if you're running a Mega Blaziken spread with low Attack investment, use High Jump Kick to be sure that Mega Blaziken can tank the Twinkle Tackle and then KO it with Flare Blitz. Against Mega Mawile, be sure to use Bulk Up or Will-O-Wisp first because of the Attack drop from Intimidate. If using Substitute, be sure to use it on Naganadel after Protect in order to beat it, if they used Draco Meteor turn one. If running the alternative EVs of 252 HP / 64 Atk / 176 SpD / 16 Spe with a Jolly nature and facing Mega Gardevoir, Mega Evolve and use Protect on the first turn. On turn two, use Bulk Up so Mega Blaziken does not get OHKOed by Psyshock. Against Naganadel, use High Jump Kick twice to finish it off. If you are running the 128 HP / 80 Atk / 236 Def / 64 Spe EVs, use High Jump Kick turn one against Zeraora, using Protect turn two if they don't Fake Out and continuing to use High Jump Kick if they do. Against Haxorus, simply use Protect, Bulk Up, and High Jump Kick on turns one, two, and three, which will tank and knock out any set.
Team Options
Mega Blaziken appreciates Pokemon that can take care of Water-types like Tapu Fini and Mega Slowbro, so Electric- and Grass-types like Magnezone, Zeraora, Mega Venusaur, and Tapu Bulu are geat partners. In return, Mega Blaziken can threaten Pokemon like Mega Charizard X and Y and Mega Metagross for them. Mega Blaziken struggles against Dragon-types like Dragonite and Garchomp, so Pokemon that can threaten them like Greninja, Tapu Fini, and Choice Scarf Tapu Lele make for good partners. In return, Mega Blaziken can take care of Steel-types like Choice Scarf Genesect and Magearna. Multiscale and Sturdy users like Dragonite and Magnezone pair well with Mega Blaziken because of their ability to take on Meloetta and Victini. In return, Mega Blaziken can take care of troublesome Pokemon like Mega Charizard X and Mega Metagross. Wallbreakers like Kommo-o, Porygon-Z, and Magearna can defeat Pokemon like Zygarde-C and Mega Gyarados. In return, Mega Blaziken can threaten Mega Metagross for them. Walls like Mega Slowbro and Mega Sableye help with Dragon-, Ground-, and Steel-types like Choice Scarf Haxorus, Naganadel, Landorus-T, and Garchomp. In return, Mega Blaziken can take care of wallbreakers like Normalium Z Porygon-Z and bulky Zeraora.