Overview:
Flygon is one of those good Pokemon that suffers an inferiority complex. Much like Dragonite was in the shadow of Salamence, Flygon is outclassed by Garchomp, who shares the Dragon/Ground typing. This does not mean that Flygon is bad, however. Flygon sports base 100 Attack and Speed, which are above average (Flygon is only 2 base points lower than Garchomp in terms of Speed). Also, Flygon sports 80/80/80 in his defensive stats, which are only average but not horrible. Flygon has one advantage over Garchomp: the ability Levitate. This gives Flygon an immunity to Ground moves, which it can use to switch on, as well as not being affected by Spikes and Toxic Spikes, something Garchomp can't do. Flygon's movepool also mimics Garchomp's, thus having what it needs to do its job. A double weakness to Ice and not having outstanding stats puts Flygon in the lower tiers, but he is left unchecked, you'll see why Master Drake of the Hoenn Elite Four used Flygon.
Abilities (well, ability):
Levitate: Makes Flygon immune to Ground-type moves, Spikes, and Toxic Spikes. This is a great ability, as it gives Flygon more opportunities to switch in and sweep.
Movesets:
Choice
-Earthquake
-Outrage/ Dragon Claw
-U-Turn/ Stone Edge
-Fire Punch
Item: Choice Band/ Choice Scarf
Ability: Levitate
Nature: Jolly/ Adamant
EVs: 252 Attack, 4 Sp. Defense, 252 Speed
This set aims to let Flygon be boosted right off the bat and sweep. Earthquake is one of the best moves in the game, and has STAB on Flygon. Outrage also gets STAB on Flygon and hits hard on almost everything. Because Outrage locks you in and confuses you once the move is over, Dragon Claw can be an option, although the power drop is very noticeable. U-Turn allows you to scout and keep your momentum up, but Stone Edge provides some extra coverage, particularly many Ice-types. Fire Punch also covers Ice-types, as well as providing a good way to deal with Bronzong.
The choice item is dependent on whether you are looking for power or to make Flygon more of a revenge killer. Either nature could be run with either choice item, but Jolly with Choice Band and Adamant with Choice Scarf works best. The EVs maximize the two stats Flygon needs.
Non-offensive Flygon?
-Dragon Tail/ Dragon Claw
-Substitute
-Roost
-Toxic/ Tailwind
Item: Leftovers
Ability: Levitate
Nature: Impish
EVs: 248 HP, 252 Defense, 8 Sp. Defense
Flygon isn't really defensive, so this set is very much a gimmick. However, Flygon does sport 2 immunities and 3 resistances, so it may not fail too badly. Dragon Tail is great if you have entry hazards up, which can help you rack up extra damage. If you don't have entry hazards for some reason, Dragon Claw works better, plus it has higher accuracy, power, and priority. Substitute gives you a buffer against status conditions and some damage, while Roost heals off damage done to Flygon, even HP lost to set up a Substitute. Toxic can wear out foes, but Tailwind is if you really want Flygon to give extra support to the team by boosting Speed. It does help Flygon, though, so it is a decent option.
The nature and EVs make Flygon into a physical wall of sorts, but a Careful nature with 248 HP, 8 Defense, and 252 Sp. Defense can be done if you want more of a special wall. Again, this set is more of a gimmick than anything else.
Other Options:
-Flygon can go a mixed route, but with a base 80 Sp. Attack and no boosting moves, it isn't advised.
Counters:
Flygon is not easy to counter, but physically bulky Pokemon can somewhat counter Flygon. Suicune and Milotic can tank some of Flygon's moves and hit back with a super-effective hit. Escavalier can take any non-Fire moves and can strike back with powerful moves like Megahorn. Weavile can desimate Flygon with its powerful STAB Ice moves, but it will need Ice Shard to outspeed a Choice Scarfer. If you can burn Flygon somehow, he won't be able to dish out as much damage. If you can play it smart, you can keep this mini-Garchomp from wrecking your team.