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Because electric type pokemon would have granted people more familiarity with electricity.
Which species of Pokemon exist changes over time to reflect their surroundings. Most pokemon based on modern technology are likely products of their modern surroundings, including electric types. Electric types probably wouldn't exist 500 years ago, in a society without electricity.
Probably would have sped up the development of technology in areas that would benefit the usage of pokemon, like biology, psychology, veterinary etc.
Dangerous Pokemon would wipe out the human race. Even Magikarp (widely agreed to be the weakest Pokemon) can jump a mountain.
Legendary Pokemon are unique and some are more than capable of carrying out first strikes against others due to the nature of their power. Thus breaking the M.A.D doctrine.
If the need for technology is already fulfilled by the powers of the pokemon the development of technology would be slower
The need for technology wasn't fulfilled until present days, which means that even with pokemons, society would want technology to always make them better and improve the ways we could use them.
But there would be no need for many of the technologies used. I doubt there would be cars when there are Pokemon that goes faster. Cranes when there are Pokemon that are stronger. It's the same as who would ride a car that is faster than a horse. There would maybe advances in terms of domestication.
This could also simply have people harnessing Pokemon as fuel