What I don't understand is why people believe Swagger to be an 'illegal' move over at smogon
Because Swagger in itself is really "unfun" and total RNG double edged sword that is either:
1) Works against yourself (You can kill your own team with a Swagger'd enemy)
2) Totally works against the enemy (Insta Gib your own enemy)
Swagger is a totally frustrating tactic for both players in the field. Its more of a matter of anti-frustration than anything else. Otherwise, battler online would just probably run Swagger on all 6 of his/her pokemon and be a complete jerk.
= it turns the game into Russian Roulette. A bad one. Smogon tries/tried to reduce Russian Roulette in Pokemon battling. Also SWAGplay needs to be mentioned (Swagger + Foul Play = one of my favorite combos in Anything Goes ;3 )
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Moves I hate being used at:
Swagger = Even SMOGON hates it. Anyway, i hate getting Swaggered by WILD POKEMON especially on those EXP/EV training hotspots. Also, if I remember correctly, Maxie and Tabitha in Emerald (Mossdeep Space center) would use this atrocious tactic of their Mightyenas spamming Swagger the moment they see your pokemon use its Attack boost (Bulk Up, Swords Dance, etc), so your pokemon with its +6 attack boost (2 Swaggers + Swords Dance) would KO itself in one go.
Evasion moves = 4/5 of the time, the first buff doesn't work on the player. 5/5 times the first buff works with the AI, and if I remember, in older gens, status moves that would negate Evasion buffs such as Foresight and Lock On still need ACCURACY for them to hit. So if the enemy managed to evade the first attack after its Evasion buff, and it keeps spamming those Evasion moves, there is almost no way for the player to remove the +3 (which is enough to cause frustration) EVA boosts.
Magnitude = When i use Magnitude, i get 4 to 7s even the occasional 8s if I'm lucky. Enemy Gravelller used Magnitude. MAGNITUDE 10!
Moves I hate using or dealing with:
Bide = pretty self explanatory, especially if its the ONLY ATTACK MOVE the pokemon knows, making its training extremely difficult without constant switching in or EXP Share.
Take Down = Oh boy, those annoying times of raising a Beldum (from Steven at RSE). Anyway, Take Down.. its Tackle with higher base power but with Recoil and way less Accuracy as well.