Do you guys think that in the past, humans were much like Pokemon?
And rather than capture pokemon they treated each other as almost equals?

I'm trying to piece together some of the lore by taking some of the information from Diamond and Pearl

"There once were Pokémon that married people. There once were people who married Pokémon. This was a normal thing because long ago people and Pokémon were the same."

And what could have caused Pokemon and Humans to become seperate? Possibly the threat of war, and conflict.

"A young man, callow and foolish in
innocence, came to own a sword.
With it, he smote Pokémon, which gave
sustenance, with carefree abandon.
Those not taken as food, he
discarded, with no afterthought.
The following year, no Pokémon
appeared. Larders grew bare.
The young man, seeking the missing
Pokémon, journeyed afar.
Long did he search. And far and wide,
too, until one he did find.
Asked he, "Why do you hide?"
To which the Pokémon replied...
"If you bear your sword to bring
harm upon us, with claws and
fangs, we will exact a toll.
"From your kind we will take our
toll, for it must be done.
"Done it must be to guard ourselves
and for it, I apologize."
To the skies, the young man shouted
his dismay.
"In having found the sword, I have
lost so much.
"Gorged with power, I grew blind
to Pokémon being alive.
"I will never fall savage again.
This sword I denounce and forsake.
"I plead for forgiveness,
for I was but a fool."
So saying, the young man hurled the
sword to the ground, snapping it.
Seeing this, the Pokémon disappeared
to a place beyond seeing..."