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In terms of survival, I'm gonna have to go with Dunsparce.
Since its good at digging with its tail, land travel will be relatively safer aside from subterranean pokemon. If smart, he could dig into the side of a mountain and spiral upwards so we can get to the top easier. Or hell, just dig a hole and bunker down for the night.
If realistic is leaning more towards anime stuff, then we'll be doing more running than fighting. Glare to paralyze things, Yawn to put to sleep, Screech to make them stop and hold their ears.