Relicanth

Say hello to the overall best Rock-type in NU. Relicanth has a lot of things going for it: it has the highest physical bulk in the tier (beating out even Shuckle), it's decently strong, it has great abilities, and its secondary Water typing is decently useful despite it adding weaknesses to Grass and Electric. Thanks to these factors, Relicanth can take on an offensive or defensive role for your team, making it easy to fit on teams looking for a good Normal and Flying check. However, its really common weaknesses, particularly its weakness to Fighting, are awful, and while it's a physically defensive behemoth, its Special Defense is pretty lacking. That said, you really can't go wrong with including Relicanth on your team; just keep an eye out for errant Grass-type attacks.