There are some Pokémon that are tied to the very nature of that universe that from a moral perspective it is reckless, irresponsible, or outright evil to catch them.  However, as the pokédex repeatedly points out, a lot of Pokémon are really freaking dangerous to be left to their own devices.  So its actually more morally good to catch these Pokémon so that they can't lay waste to entire civilizations!  And that's what Jeff and Dustin chose to talk about this week!