To awnser your first question the current meta game has A LOT of SP but at my states in the masters division I saw a lot of donchamp/ straight machamp and yanmega prime with machamp. (Though I'm not really sure how that last one works.)
And to awnser you second question if you play SP theres a big list of decks I'll name a few of them: luxchomp, dialgachomp, luxape, BLG, toxitank and sablelock. (if that counts as SP) But if you dont play SP theres donchamp, yanmega, jumpluff, vilegar, gyarados, tangrowth CoL, magnegatr, magnerock, straight machamp, mewpherior and mew toolbox. Thats all I can think of.