Some sentimental couples like to use promise rings as a symbol of commitment. Others like to tattoo Pokémon on their lower torso. In the end, both ideas get relatively the same job done, but only one requires a laser for removal. Or both, if you suddenly come down with a case of the Goron hands.
I don’t know about you guys, but Luvdisc (#370) is certainly my favorite Pokémon that falls within the 360-390 range on the National Pokédex. Quick, somebody name at least 7 others from that range without consulting your Pokédex!