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It depends on your definition of love, really? But Alomamola is also a heart shaped fish Pokemon that could fit. There's also Blissey, whose species is entitled the "Happiness Pokemon", and is described to be a very loving and caring Pokemon.
Audino kind of fits in with this, since it senses and reacts to the heartbeats of trainers and other Pokemon. And maybe Smoochum, too? It kisses everything so that it can learn about it, but I guess that could be related to love in a way.