>>51313325I've had my fair share of dealing with these guys in Alola. If you have some oil you can send them running back to the lake because breathing in oil isn't comfortable for them.
BUT DO NOTE: The Araquanid isn't trying to eat your Wooper or harm it, it's actually trying to protect it. Araquanid are very caring creatures and will often drag small pokemon into it's bubble to protect them. When the Araquanid is trying to get prey, it'll use it's legs to trap the prey in bubble instead.
>>51313975Buddy, I hate to break it to you, but you should probably learn how to handle at least one Dragon-type before doing ANYTHING with mega stones. Maybe try getting a Cottonee, they're pretty low-maintenance so you can focus more on training your dragons. They help you deal with any early-stage dragon-types and you don't have to worry about them accidentally turning into a Whimsicott because they're a stone evolution.