Yeah, all this is fine and dandy, but think of the poor Durants.
What if I put you on a mountain filled with tons of flaming human-eaters. How would you feel? Oh that's right, you wouldn't. You would be too busy being burned alive and having your insides eaten out to feel anything.
Let me give you a few examples from Bulbagarden's page on Heatmor:
Originally Posted by BulbagardenOriginally Posted by BulbagardenOriginally Posted by BulbagardenThe more you know,Originally Posted by Bulbagarden
-People for the Ethical Treatment of Durants
Would you prefer we move the Heatmor to the Gardens?
If this had been true, the Heatmors would have changed categories long ago. They did no such thing until Durant was introduced into the area. If anything, there new classification bump up means they are becoming more scarce and the new proximity they share is negative for both species.
Not to mention, Durants are more commonly found in habitats on mountains, not volcanoes. For them to tunnel effectively, they can't be near any source of resounding heat or else their truant nature activates. If that were to happen, their would be no hope for the species in being able to catch any prey at all, and they would lose any hopes of escaping from all of the many fire-type predators. As well, due to their ability to share their abilities with other creatures, the entirety of Deckbi would become filled with lazy and sleepy pokemon. This is not only a problem for the Durants, we are talking about the entirety of Deckbi being put at risk.
And don't look down on Durant's willingness to adapt to a forested environment. Albeit not being the perfect climate for it to live in, the argentine ant (to which Durant is a close cousin) prefers locations with a Mediterranean climate. This means that it needs a nice and cool winter period, filled with plenty of rain and precipitation. Deckbi is known for catering to the fire, ground, and rock-type pokemon who live on it; this means that there is very little in the ways of rain, because it could potentially bring in a water-type species that could potentially tip the entire ecosystem. In a case like this, one pokemon should not be forced to suffer just because it would have to adapt to a climate similar to the one it prefers.
In conclusion, volcanoes and fire = bad for Durant; forests and correct climate = good for Durant.
Ahh, but you assume that Mount Deckbi is one big mountain. I've always thought of it more as a mountain range of such, a collection of peaks, with just the largest one being called "Mount Deckbi". Taking this into mind, not all of the mountains or off-shoot parts would be volcano-laced, and so there are plenty of places for the Durant to burrow away from heat. The only other mountain in the Park (with the destruction of the Outer Heavens) is Mount Oktori, and I would argue that Oktori would be worse for the Durant then Deckbi.
Besides, in order for Durant to have survived as a species, they must have some anti-Heatmor defenses in place. If you remove them from the Heatmor and those defenses get un-used and are lost through the process of Darwinian evolution, you're essentially performing a genocide of the Durant, albeit one that takes place in the future.
I don't assume. I'm following the description given by the National Park information desk. "A towering active volcano that sports many cave systems. The volcano is a dark red-brown color and has a wide trail that spirals up it. The area around the volcano is bare of plant life and covered with gray boulders and rocks. The air is usually thick with dark gray ash once you get about halfway up." I'm not saying there aren't any other mountains nearby, but on this particular path where trainers are shepherded through, it is pretty clear that it is just one particularly large volcano with flat land sorrounding it. The volcano is basically the only area where the Durant would be able to live. The flat land is void of any plant life and really provides nothing in the way of nourishment for the Durant.
The Durant's common means of defending against Heatmor is its ability to move quickly, and tunnel at the same speed. They stand no chance at defeating even a single group of Heatmor without first getting in a surprise attack, and even then there is no telling if there are others nearby. Durant's speed and tunneling would still be useful even in a forest setting. Creating underground nests would prove extremely useful, not only giving them a new safer place to live, but also in giving the Durant an easy way to defend against in intruder; in fact, it is their favorite way to beat an intruder, in a massive group.
As well, your point works counter intuitively; you just released a swarm of Durant who are used to a peaceful environment filled with resources, and no predators who actively seek them out, into an area filled with predators who will quickly take advantage of their current naivity.