I'm about to start chain-fishing for shinies. I'll need a catcher 'mon and something with Suction Cups/Sticky Hold for easier fishing, and that's all, right?

Any suggestions on what 'mon I should try for first? This is my first time ever chaining (even if it's not via radar) so I'm a little giddy about it even though I know the shinies are gonna be shit.
Pic potentially related, might end up being my first target.