Moves
Hurricane is Mega Pidgeot's STAB move and its most spammable move; its reasonable 30% chance to inflict confusion on its target is a useful bonus. Heat Wave allows Mega Pidgeot to OHKO Scizor and Ferrothorn, as well as hit a whole slew of other Steel-types super effectively. Pidgeot's base 101 Speed is good but somewhat middling before it Mega Evolves; therefore, Protect is a useful choice for safely acquiring the Speed boost that allows Mega Pidgeot to outpace Pokemon such as non-Choice Scarf Garchomp, Terrakion, Mega Gallade, Mega Metagross, and Raikou. U-turn is another solid scouting option here, as non-Mega Pidgeot's Speed tier is good enough for it to not need Protect against a lot of threats; U-turn allows Pidgeot to scout for counters switching in and answer accordingly, maintaining your team's momentum. Substitute is similar to Protect in that it shields Pidgeot from most offensive attacks and status moves, but it differentiates itself with a potentially longer-lasting effect; it also has good synergy with the confusion from Hurricane's secondary effect. Lastly, Hidden Power Ice is a useful move for exploiting Mega Pidgeot's Speed tier and high Special Attack to heavily damage threats such as Garchomp, Landorus-T, Gliscor, and Mega Salamence. Roost is a useful move that can be used in either the third or fourth slot; however, running Pidgeot without Hidden Power Ice means that it cannot perform its niche of checking Gliscor, Landorus-T, and Mega Salamence quite as effectively, whereas losing Protect can make Pidgeot vulnerable to Pokemon such as Garchomp and Terrakion on the turn it Mega Evolves. Recovery is also not much of a priority for Pidgeot in Battle Spot Singles, where its frailty and the fast-paced nature of the format can limit the opportunities that Pidgeot has to heal itself.
Set Details
Mega Pidgeot's base 121 Speed is a valuable benchmark to have in a format where most of the relevant threats are base 100 Speed or faster; therefore, a Timid nature and 252 Speed EVs are essential in order to outspeed and KO dangerous threats such as Mega Salamence and Mega Lucario. 252 Special Attack EVs make Pidgeot's attacks as strong as possible, leaving the last 4 EVs to go into Defense or Special Defense.
Usage Tips
Mega Pidgeot beats a very specific number of threats and needs support for another specific group of threats. No Guard Hurricane and Heat Wave give it a solid matchup against Grass-types and Fighting-types such as Mega Venusaur, Serperior, weakened Conkeldurr, and Mega Lucario, and Hidden Power Ice gives it Dragon-slaying utility with its fantastic Speed tier—on the other hand, these three moves are completely walled by Pokemon such as Chansey, Tyranitar, Rotom-W, and Heatran. No Guard also allows Mega Pidgeot to completely bypass any and all evasion changes, completely nullifying Minimize strategies as a threat to your team. However, it also bestows perfect accuracy upon moves used by the opponent, making users of inaccurate moves such as Thunder and Stone Edge and OHKO moves such as Horn Drill and Sheer Cold very scary to face.
Team Options
Mega Pidgeot is a powerful attacker, but its shallow movepool makes it very predictable and easy to stop. Hurricane spam helps a lot versus its checks if Mega Pidgeot gets the confusion, but Mega Pidgeot will often find itself being forced out by a Tyranitar, Heatran, or Rotom-W, all of which are very common thanks to the ubiquity of Talonflame. As such, it's highly recommended that you come prepared with answers to these Pokemon to allow Pidgeot to have a much better time. Ground-types and Fighting-types are the best catch-all answers to these three Pokemon: Mold Breaker Excadrill's Earthquake can weaken them sufficiently for them to be picked off by Mega Pidgeot's Hurricane; Assault Vest Conkeldurr can throw out Drain Punches and Mach Punches while being able to absorb Rotom-W and Heatran's status moves with Guts and throw out Guts-boosted attacks in return; Landorus-T and Garchomp exacerbate Pidgeot's Ice weakness considerably but are still worth consideration for their powerful Earthquakes and other utilities; and Dugtrio is a niche, but decent, option for trapping and removing Tyranitar, Heatran, and grounded Electric-types such as Raikou.