>>51240315You're playing the game wrong if you struggle with the level curve. Do the side activities and revisit old areas, the place when you can get a Lapras is full of decent trainers. I find that the Goldeen and Seaking on Route 42 give good exp, you can grind on the Heracross there too in the earlygame.
If all of that is still too slow for you just transfer a Lucky Egg from Platinum, with a compound eyes pokemon you can get a Lucky Egg off a Chansey in one sitting.