I was once routed by a Gengar who critted 4 times in a row on my team. Morale of the story; Crits happen and Sucker Punch is good Gengar repellent.
Pain is getting flinched 3 times in a row by an Aerodactyl.
"Well, we're semi-trained quasi-professionals at any rate." -Roy Greenhilt
Meet Tropius, the once good Grass type nerfed in X & Y
Honestly the key way to play Mega Gyarados is knowing WHEN to mega evolve. For example, standard Gyarados has access to Intimidate, which you may need if your opponent has a powerful Physical attacker. Also, you may not want to Mega Evolve if you're facing Bug types/Fighting types right off the bat. For example, Gyarados VS Conk. You won't want to smashing Conk when mega evolved because of the newly regained fighting weakness. Same thing with Scizor, Genesect, etc.
However, Mega Evolving would allow switching easier because of a nullified Stealth Rock Weakness and giving Gyarados an immunity to Psychic types and not taking quite so much from electric attacks.
the attack tho
Credit to Astral Shadow!
Gyarados getting a Dark-type Mega Evolution is useful, but would really benefit from Crunch, especially with THAT Attack stat. So yeah, Gyarados is still limited to Water-type STAB, or Bounce and Bite. Although, that attack stat can cover for a lack of STAB moves. As for moves, Earthquake and Aqua Tail are absolute must-haves on any set, for STAB and Electric killing, although Gyarados is quite often outsped by Electric types. Bounce and Bite are the other viable STAB moves for non-mega and mega respectively. As for other moves, Payback actually works well due to the sub-par Speed, and Dragon Tail can remove a stubborn Physical wall. Stone Edge can hit hard as well. All in all, though, Gyarados still suffers from a poor movepool, and the typings don't really help much. Even as Mega Gyarados, most Thunderbolts will 1-2HKO the creature.
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Spoiler:- ASB stuff:
Mega Gyarados takes Electric-type attacks surprisingly well. For instance:
252 SpA Thundurus-T Thunderbolt vs. 0 HP / 0 SpD Mega Gyarados: 254-302 (76.7 - 91.2%) -- guaranteed 2HKO
That's Choice Scarf Thundurus-T, essentially the most powerful Electric-type Scarf user in the game, and it fails to net a OHKO without prior damage (in fact, it's only a 25% chance even after Stealth Rock). Mega Gyarados also takes weaker attacks such as defensive Rotom-W's Volt Switch with incredible ease, which lets it set up all over those guys. 95/109/130 bulk with Intimidate on the first switch-in is just jaw dropping.
Intimidate w/ Gyaradosite/Assault Vest
Adamant w/ 252 Attack, 252 Sp Defense, 6 HP
Ice Fang/Outrage/Iron Head/Avalanche
High Defense & Attack w/ Electric/Rock/Grass/Fighting/Bug/Fairy-type moves like Wild Charge Tauros/Bouffalant/Klinklang, Thunder Fang Durant/Tyrantrum, or Thunder Punch Dragonite.
Got Pokémon X. Intend to get either Omega Ruby or Alpha Sapphire.
No info about my Friend Safari.
Vivillon Pattern: Polar
Looking for nicknamed, shiny, and/or have a hidden ability in GTS and may battle at anytime.
If interested, send a private message with your ID #.