I have Platinum since Thursday. This is what I've done so far:
I chose Chimchar as my starter, because I thought I can't get fire type pokemon early in this game. Then I fought my rival for my first time.(His name is Daniel btw) He kept spamming Growl and I lost the battle. Then I was at Sandgem Town, got the pokédex and stuff. Then to Jubilife City, met Looker, got the Pokémon Watch and all the other stuff. I catched a Psyduck, a Shinx and a Geodude and beat Roark in Oreburgh City. His Cranidos was so hard. Then I went to the Valley Windworks, defeated Mars and saved the game.