i just thought of these 2 shipping in my mind when i looking up about mlp spongebob crossover at fanfic.net
NOTE(the first one is not mine it was made by another person who wrote a oneshot and a fanfic in progress which is spongeshimmer oneshot and sunrise respectively on fanfic.net i am just spreading it because i kind of like it)
spongebob and sunset shimmer
patrick and rarity
patrick and rainbow dash