Well at least I'm not the only one getting stabbed with the meanness of people.
Not trying to make light of your situation, but I just had to make myself feel a little better...the way my life is going at the moment...
Back on topic, I'm 16 and believe me, I get a lot of crap from people too. I mean, high school is going to be rough if you let this thing get to you. My advice, and you can take it or leave it, is to just do what I do when people don't accept things the way I do(don't worry, this includes Pokémon)---ignore it.
Let me explain. If they are your friends, tell them about it. Let them have a little taste of Pokémon. Explain to them the deeper meanings of it, and show them how it is more than "a crappy kids game." If they don't accept it, then fine. They don't have to like Pokémon. Everyone is different. But just tell them to stop making fun of you for playing it. If they stop, then they are really your friends. However, if they continue, then they are not your friends. That's where you ex-communicate them(I just really wanted to use that word. Basically have nothing to do with them).
Now if it's just some random person being mean, then tell them this: "Look, I like Pokémon. I don't need this crap from you, or anyone else. If you don't like Pokémon, that's fine, but don't bother me about it then. Keep your thoughts to yourself." Then walk away. That's it. Talk loud so other people can hear you. Using this method, people will see that you stood up for yourself, and see that you faced the situation in a mature way, and didn't flip out and give in to what they are looking for. Also, by walking away, you avoid any comeback that they might have in store, and you leave them stunned.
With your brother/sister(idk which one. Honestly I didn't even read all the other posts in this thread. I just wanted to voice my opinion before I had to get off. I'll probably read them tomorrow.), I'm not sure what you want about that one. All you said was that he/she "sees me playing Pokemon." If he/she is giving you a hard time, just ignore them completely. Eventually they'll need you for something, and that's when you tell them to knock it off. If they don't, just ignore them. You don't need them in your life. Eventually they will back off.
The bus situation, well...just sit somewhere else.
This advice might seem a bit abrasive, but trust me. Most of the time this stuff works. And you really need to stop this now while you have a chance, because things are going to get much worse in high school. Trust me. I'm still trying to erase things that I should've stopped back in middle school. Stop it now while it's still small.
Well that's all, better go finish my work. Night. >.>
~Rodrigo