If 1 Pokemon can be ruled unneccessary, ANY Pokemon could be ruled unneccessary.
Just as there are countless creatures in this world, there are just as many myths and legends filled with mysterious creatures: Bigfoot, Yeti, Loch Ness Monster, Chumpathingy lol....Not to mention completely fictional creatures like dragons and such. As long as each Pokemon's legend is unique, I see no problem with adding more.
I'm curious, which Legendary Pokemon do you think are just totally unneeded and why?
Yes but talking strictly on the legendaries, there are a lot of unneccessery ones considering the important ones have of them have a special origin of some sort surrounding them.
Before I go listing any, im just going to say that I do like ALL of the legendaries, I like their designs and roles in the anime and such, but even I have enough common sense to notice the ones that arn't needed besides their design features. Anyway, Im talking about ones such as:
-Latios and Latias (They were just rare dragon Pokemon, they had no real legendary relevance).
-Heatran (Simply a rare Pokemon living in a volcano).
-Manaphy (It was claimed as the king of the sea, but this spot really could have gone too Lugia or Kyogre).
-Phione (Almost a commoner Pokemon with no speciality).
-Shaymin (Simply a rare flower kind of Pokemon, not really a mega legendary, could have passed as a normal Pokemon).
-Tornadus, Thundurus and Landorus (Thunder Legendary of the sky and a Ground Legendary of the Ground, didn't Zapdos and Groudon. cover these? Not only that, but what really we're the genie trio covering? It can't be the weather considering Landorus is part ground).
-Keldeo (We had a trio of Musketeers, I don't understand fully why Keldeo was neccessery aside from existing to join the trio. I understand the musketeers did actually have four members, but why make Keldeo different in terms of being younger and weaker?)
-Meloetta? (She could have easily been a normal Pokemon instead of a simple singing Pokemon).