Creatures like Venser, Shaper Savant, and Hullbreaker Horror can easily serve as removal, all while providing a combat-ready body
Phantom Blade and Assimilation Aegis are the standouts here, providing repeatable removal that can take out your opponents biggest threats each turn, and can be easily searched for by the decks variety of Equipment tutors
In general, I would look at these two factors when looking to include cards not of your tribe's creature type: Is this creature so strong that it, on its own, is generally stronger than my tribal creatures when they are receiving bonuses and/or empowering my other cards
Its less about balance and more about showcasing whats possible, serving as a reminder of how far the Pokmon TCG has come since its early days
The idea of card advantage is the entire premise that control decks are built on
Ns Zoroark is probably the most awaited deck from the set