How to prove that franticshipping is canon in 4 easy steps:
1. They have canon confessions from the RS arc.
2. Their hand holding evolution from RS volume 20 to ORAS volume 3.
3. Their declaration of wanting to spend the rest of their lives together forever. In this is case, their "last moments".
4. PokespediaーPokespe's official data book that came out in 2017ーstated in the relationship chart that they "love" each other.
Best part? We don't need a kiss to prove it~