Duraludon is nice.

DewyGooey

I just like Duraludon because it has long range. Not only that, but Duraludon can mostly revolve around its basic attack with one of the level-up moves you gain, Flash Cannon. It can make your range even longer and even stronger! Duraludon is also relatively resistant when it stays within the goal zone, so I can just defend against pretty much anything when there's a teammate distracting them from the massive damage bursts that I give behind them. Combine Flash Cannon with two of the basic-attack-boosting held items, those being the Muscle Band and the Rapid-Fire Scarf, and you basically get yourself one of the best non-labeled defenders around.

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I hope I didn't post this twice.