This is correct. I've fought oak using cheat devices to activate the fight, he has those 4 and the starter that neither the player or the rival chose all upwards of level 80.
Meh that's just 200% damage while Meganium is getting a 500% damage bonus because it's their attack power + stab which is 50%, multiplied by weakness which is times 2.
That means your damage is just a bit above average had you been using a Same type attack bonus move on an enemy with no weaknesses/resistances, while they're doing more than double that.
Wouldn't the STAB+super effective of grass on water only be 300%?
Now,abusing STAB electric on Gyarados is about 600% thanks to a dualtype weakness multiplier of x4.
the day my ingame rival AI isnt ******* retarded and way underleveld ill think back at this moment and think "wow, thats really neat advice" as i pick any of my other 5 pokeymans to beat his **** in with
STAB-typing is always important to consider. sometimes using a high powered not very effective STAB attack is better then using a lower powered neutral attack