Why is Pokemons the ONLY JRPG where Grinding is Fun/Acceptable?

[SmokedHostage]

Grinding is easy in Pokemon. Just find a Lucky Egg from a wild Chansey, let your Pokemon hold it, then battle Happiny/Chansey/Blissey, they give the best EXP. If only Diamond and Pearl had secret bases. Then you could have a battle with 6 Happiny/Chansey/Blissey every day for the best EXP.