Pokemon GOhas hundreds of Pokemon for players to find, catch, and battle. With Pokemon up to the sixth generation being implemented, there aren’t too many generations left to catch up on.
Despite reaching the Kalos region, however,Pokemon GOis still missing multiple legendary and mythical Pokemon from generations that have been at least started to be implemented. While some of these may appear in future raids and events, others have more questionable statuses.

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Despite being technically separate categories, manyPokemonplayers lump mythical and legendary Pokemon together due to their similar statuses of usually being one of a kind. With some mythical Pokemon also being related or connected in some ways to certain legendary Pokemon, the waters continue to get muddied. Both, however, will be listed.
Manaphy
Manaphy is a pure water-type Pokemon technically introduced before Pokemon’s fourth generation inPokemon Ranger, but was first made actually available in gen four. This Pokemon was given to players through aspecial looking eggthat they had to hatch to get Manaphy. While the original event required to get Manaphy was a bit of a pain to deal with, future events and giveaways made getting this Pokemon much easier, but it has yet to appear inPokemon GO.
Due toPokemon GOhaving a special mechanic withPokemon eggs, there could be an event at some point in the future surrounding Manaphy’s egg. It could require more steps then any other previously seen Pokemon egg, but there is no word on this.

Phione
Phione is another purewater-type Pokemonfrom generation four, and it greatly resembles Manaphy due to Phione’s parentage (a rarity). With Manaphy not being implemented intoPokemon GOit makes sense that Phione is also not in yet. However, this could also be due to how players are meant to get Phione in the mainline game. This involves a feature that is not inPokemon GO,and it being unknown if the feature will ever appear in-game.
For players to normally get Phione in most Pokemon games, they would need to put botha Dittoand a Manaphy in a Pokemon Daycare. This is to convince the two to breed and make a hybrid of the two, Phione. Considering how reliant Phione’s existence is on this, its unknown how this would happen inPokemon GOat all.

Shaymin
Shaymin is yet another Pokemon from the fourth generation and is a puregrass-type Pokemon, though it can transform into its alternate Sky Form which changes its appearance and type into a dual grass and flying-type. Normally, one would think that Shaymin’s dual forms would be the reason for it not yet appearing inPokemon GO, but this likely isn’t the case. This is because of Giratina, another Pokemon fromthe Sinnoh region, having dual forms with players just being able to catch it in either form. It can also be compared to the different forms of Deoxys since none of these Pokemon have access to the item or location that controls their form changes.
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Arceus
Arceus is the final member of the creation trio and is widely considered to be the god of all Pokemon. Game lore states that it is the creator ofthe Sinnoh regionas well as possibly the entire universe ofPokemon. Arceus’s god status isn’t likely what is keeping it from appearing inPokemon GOyet, rather it could be due to its alternate forms. While certain Pokemon have usually only a couple alternate forms maximum that change their stats or typing, Arceus officially has eighteen different forms with a different form for each Pokemon type.
While Arceus’s form changes in the mainline games are controlled by its held item, these are not available inPokemon GO. With its status making it a contender for araid boss Pokemon, it would also be unlikely that there would be eighteen variations of Arceus available in raids at once. Because of this, it is unknown when or if Arceus will be added.

Keldeo
Going into generation five, Keldeo is also yet another Pokemon not yet added intoPokemon GO. Keldeo is not alone from the Unova region, however, with other gen five Pokemon such as Larvesta, Munna, and Zorua still not having appeared. Like many of the other Pokemon already mentioned,Keldeo has two different forms. One is its normal form and the other is its resolute form. This form is activated if Keldeo knows the move Secret Sword, its signature move. It is unknown if this would be how the form change would occur inPokemon GOor if it will simply be able to be caught in one form or another when it is finally released.
The Kalos Legendaries and Mythicals
With the sixth generation of Pokemon only now being added intoPokemon GO, there are still manyKalos Pokemonstill not implemented. Since it’s mostly early-game Pokemon fromPokemon XandPokemon Ythat are currently added, it makes sense that the legendary and mythical Pokemon still aren’t in yet.
When it comes to it, players will be able to look forward to Xerneas, Yveltal, Zygarde, Diancie, Hoopa, and Volcanion. With Xerneas and Diancie, players inPokemon GOwill finally be able to have access to a mythical and a legendaryfairy-type Pokemon, as the fairy-type was introduced in gen six.

Considering the track record when it comes to the previous generations, it might take some time for these Pokemon to actually appear for players. This delay in release seems to be more common for mythical Pokemon than legendary Pokemon, though, so Xerneas, Yvelta, and Zygarde will likely appear before Diancie, Hoopa, and Volcanion. Nonetheless, there has been no word on any of these Pokemon as of January 2021.
Of course, afterPokemon’s sixth generation, none of the legendary or mythical Pokemon from either gen seven or eight have appeared inPokemon GO. The only exception to this isMeltan and Melmetal, who actually made their first appearances inPokemon GOinstead of a mainline game.

Pokemon GOis available now on Android and iOS.