I can see it clearly now. Remember how anabel came back in gen 7 after not existing for years? Well Ingo is the same deal. Hes a faller like her
>warped to new environment
>no memories
>regarded by others for battle skills
>was a former master of facility that only the most skilled (or most dense to keep charging in) could reach
The memories and new land thing also apply to looker. Mark my words, ingo will end up in interpol through either hoopa/arceus/UB bullshit and join up with looker and anabel who befriend him because of similar stories. Gamefreak is setting up an interpol team comprised of one character from each gen. We got gen 3-5 already, so who knows who'll be next to be isekai'd. Or, maybe it'll be just them 3 because trinity of golden years