Iridescent Gilnt Beetles appear in Smash Run as a bonus enemy.
When one appears, the ground around them will rumble and the beetle will show up. They will wander to one area of the map every few seconds, pausing for a bit before walking around. When hit with a strong attack, they will drop gold in bronze, silver or gold form depending on the strength of the attack. When hit too much, a beetle will dig back into the ground and disappear, although it can still be hit to drop more gold. When hit enough times, the beetle will flash rapidly; this means it is invulnerable, will not drop anymore gold and disappear.
Hope you're not scared of bugs... In Pikmin, these guys drop nectar, but in Smash Run they drop coins instead. They hide, waiting for fighters to get too close...then strike! They're tough to catch, but your reward for success is coins, coins, coins. They'll slink away to sulk after being properly robbed.
A golden creature from Pikmin 2. They don't pop up very often at all, but when they do, they scuttle around speedily. When you flip them over, they drop nectar and rare treasures. In Smash Bros., they appear in Smash Tour, where you can bump into them to make them drop extra fighters!