Well, powerful Pokemon are powerful depending on how you breed them and how much you train them
Pokemon can get powerful like ash pikachu. Pokemon Can Get Strong & Very Powerful So The Answers Is Yes.
No, they just look cooler to some people.
That depends on your definition of powerful.
Pokemon
Evolutions? That means, when a Pokemon levels up to a certain level, it will change into a more powerful and stronger form. The most stages a Pokemon will go through is 3, each getting more powerful. However, some Pokemon do not evolve at all. hope that helped, pickomon
Arceus
probibly regigigas
You can catch heracrosses by headbutting trees. But in order to have a powerful heracross your going to have to do some training. sorry.
In battles, a Pokemon VMAX card is generally more powerful than a Pokemon VSTAR card.
lugia
There is no powerful Pokemon. All the Pokemon found in the ruins are Unown. The special ones you may be thinking of are the new "?" and "!" Unown.
Pokemon indigo is about creatures that are magic and powerful.