Be nice to them and EAT THEM ALIVE!!!! I'm kidding. If you respect them, they will respect you back.
Let your parentsmeet him or her
by getting them what they want like money.
tell them you want rats
That might not be the best idea. Your parents have a reason to not want you to move in with him/her.
if you want to convice your parents for you to get a 3ds tell them how awesome it is and then beg till you get it
You don't. If you want one get it when you are 18.
Just do it yourself if you want it so bad...
What do my parents need to do to let me be adopted by my aunt and uncle at sixteen
Is that between a child's parents? if so it is ultimately up to the parents. But, most parents will let the child decide who they want to live with.
You don't "make" your parents do anything. They are your parents and have reasons why they don't want you to do things. Ask them the reasons.
If you really like him and he treats you right, don't let them stop you.
Tell them all the reasons why you want one