>>18028392If we know beforehand that Gen V wasn't going to have any cross-gen evos/prevos, we wouldn't have assumed any connection between Luvdisc and Alomomola.
Carbink and Diancie are from the same gen so there was no reason to assume any design decision was preventing them from being related.
Also, fish looking similar to unrelated fish is to be expected. Rock/jewel monsters are completely made up, so GF making 2 look conspicuously similar while not making them related would be retarded.