@Jarkes  
In my experience with Mega Gyarados, it’s actually pretty awesome. Switching from Water/Flying to Water/Dark means certain electric attacks are now 2HKOs instead of OHKOs. Meaning it gets one turn to DD, at which point it doesn’t matter that it gained three weaknesses because it’s going to be oneshotting almost everything.

@HighRollerHydra
 
Admittedly, I did do the Super Training for 5 out of 6 Pokemon on my X team (and spent at least an hour trying to get Reset Bags since I hadn’t done it right from the start), and I also ended up Super Training my Gardevoir’s Special Attack and Speed on my Y team (and it conveniently had a nature that boosted its Special Attack, too), but in previous generations, I didn’t really worry about that sort of thing.

@Jarkes  
Pretty much I’m the same as you.

@Grumpykins
 
Besides, it’s not like you can directly tell which stats have perfect IVs or not… They just have that vague “stats judge” guy found in the battle facilities.

@HighRollerHydra  
Speed Boost ability gives you a speed buff every turn,Baton pass passes buffs and de-buffs .  
Give Scolipede a Sword’s Dance with one or two turns of Speed Boost,pass it to any more…tanky Pokemon and you can sweep bitches like a boss.

@Grumpykins
 
I don’t do competitive battling. I just want to enjoy the game and not have to worry about EVs, IVs, or having the correct nature… I mean, those still help when playing single-player, but I don’t usually find myself constantly catching a certain Pokemon so that I can be sure it’s the right nature, or has the right Ability, etc. …Well, okay, SOMETIMES when I’m after a specific Pokemon I want a specific ability it has, but I try not to spend hours searching for it.

@Grumpykins  
That stuff I know nothing about.

@HighRollerHydra  
Well,Perfect IV and breeding moves are good trading tokens and Baton Pass/speed boost Scolipede is a pretty acceptable strategy with any partner

@Grumpykins  
Oh…well, I don’t do battling these days, I keep running into people who used their brains to raise them perfectly. I’m no good at that, I just raise my Pokémon with a little TLC.

@Grumpykins  
Rain dance/Drought+Thunder anyone?

@HighRollerHydra  
Competitive battling  
Rain dance/Drought Thunder

@Grumpykins  
CB?

@Jarkes  
You know Electric is a pretty common type in CB,right?

@HighRollerHydra
 
And then its Mega Evolution actually ends up giving it MORE weaknesses (It becomes Water/Dark instead of Water/Dragon like you’d think it would).

Sure, Gyarados is strong, but put it up against an Electric-type…

i think it will be better if you change that magikarp for a bidoof