>>44541539It didn't.
Having two regions and a day/night cycle took up all space on the cart. Johto was tiny and the level curve sucked because of space limitations, Kanto was heavily scaled down and had key locations removed, like the power plant dungeon, cerulean cave, seafoam islands, and the safari zone. Leaders and E4 in gen 2 are so easy and under leveled that you can beat them spamming tackle basically.
RSE had a much better level curve, a much larger and more fleshed out region, and stronger leaders that actually used hoenn mons!