oh, was also wondering about the legitimacy of game corner pokemon. i assume the limit would be one, if it's allowed at all. besides that, i assume that there are no qualms about getting tms from there, right?
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I'd say that if you already confronted a wild pokemon in Union Cave, then you wouldn't be able to go back later and catch the Lapras. But if you're lucky and don't find anything, or you use a bunch of repels, it would be fine.
A couple "sketchy" rules I've come across is the fishing and caves for the "first for an area"
My rules are surfing/fishing/land are three different parts of the equation. And as far as caves go, most of the time I go with one per "level." I.E. the area you walk into is an area, the next one down/up is an area etc, but if I come back down a different ladder and end up on the same floor, it's the same as before.
"Minsc will lead with blade and boot! Boo will take care of the details."