Can't recommend rarepons for each type, since some types will do well with many of them.
I recommend Mogyoons for Mahopons (atk spd and mov spd doesn't matter for them). Mashuriros would be good for Kibapons, they'll push and sleep everything they touch. Moriussoos for Yumipons for stagger and extra HP, definitely. Can mix with any rarepon focused on a status-attack. Melees generally should be Basaras or Wagyanbas. Don't turn them into Mogyoons, crippled mov spd hurts them, specially Dekapons.
But for hero, melees generally boil to either Basaras (lucky higher damage) or Mogyoons (consistent high damage), since Hero Mode for Dekapons, Kibapons and Robopons are barely affected by the lower mov spd, so you might as well pump their damage.