There is a problem with that actually there aren't legendaries that would fit into what I want for this sort of plot. As there are only two regions open so the only legendaries are: the Mew duo, legendary birds, legendary beasts, Tower duo and Celebi.
Out of them the only ones that are psychic types are Lugia, Celebi, Mew, and Mewtwo. For this particular plot a psychic type is needed. Lugia already been used for a plot. Celebi doesn’t have anywhere as near justification for attacking humans in such a way even if they are strange. Not to mention Celebi is a shy and playful creature by nature.
Mewtwo has a lot of potential though to work with this. As I see it is wants strong opponents it wants a challenge to prove its strength since that was it purpose in life. However if you think about it it's already stronger than all of the pokemon in cerulean cave. It probably already knew that only the strong can enter his cave. Only the player character is able to defeat it in the end.
Now with route involved it would witness a tread that it's never encountered before. A lot of newcomers at this point have extremely strong pokémon. It would want to face them at some point to prove it strength but being around for a while it would get more intrigued about the trainer themselves than the pokémon since they’re the ones that are making those pokémon strong. Newcomers equal new strength is what mewtwo would see. Now while testing this new strength would be good. Controlling it would be more beneficial. If he controls these newcomers; he could fight them against them against him anytime he wants, he could use them as a way to see if anything truly worth fighting against, he can have them breed strong and skilled opponents. That's how the plot would come about.
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Out of them the only ones that are psychic types are Lugia, Celebi, Mew, and Mewtwo. For this particular plot a psychic type is needed. Lugia already been used for a plot. Celebi doesn’t have anywhere as near justification for attacking humans in such a way even if they are strange. Not to mention Celebi is a shy and playful creature by nature.
Mewtwo has a lot of potential though to work with this. As I see it is wants strong opponents it wants a challenge to prove its strength since that was it purpose in life. However if you think about it it's already stronger than all of the pokemon in cerulean cave. It probably already knew that only the strong can enter his cave. Only the player character is able to defeat it in the end.
Now with route involved it would witness a tread that it's never encountered before. A lot of newcomers at this point have extremely strong pokémon. It would want to face them at some point to prove it strength but being around for a while it would get more intrigued about the trainer themselves than the pokémon since they’re the ones that are making those pokémon strong. Newcomers equal new strength is what mewtwo would see. Now while testing this new strength would be good. Controlling it would be more beneficial. If he controls these newcomers; he could fight them against them against him anytime he wants, he could use them as a way to see if anything truly worth fighting against, he can have them breed strong and skilled opponents. That's how the plot would come about.