I'm really sad that Swampert isn't loved a lot, but it is just so COOL! The name origin, its design concept, it is just so good in battle that in competitive they made him in OU! It is just so cool. I really love it's typing being only weak to Grass, but seriously, Ice Beam or Ice Punch and bam, many grass types will be dead to it.
Blaziken is a close second, though. It looks so cool! Those fiery kicks and punches he lands are deadly.
And, all other Water starters are third. I just love the water type in general.