Early Access Temtem is in high demand for money, and when you finish the game, there are not many ways to continue earning Temtem Pansun. The only way to do this right now is to capture and release Temtem to get rewards from FreeTem buildings in Omninesia. The first thing you need to follow this guide is a four-leaf clover, which you can find in the Aguamarina cave in Deniz.
To get there, just surf all the way to the northwest corner of the Silaro River and enter the cave. It used to be only possible to get the four-leaf clover with the crystal skates, but since the crystal skates were lost when you arrived at Tucuma, this was changed so that you can still get it.
The next thing we need is two Wiplumps with cold air technology. To find advanced Wiplumps in the wild, head to Xolot Reservoir and surf toward the heart of South Lake. You will arrive at Kakama Cenote. Go down the steps and start capturing Temtem on the left side of the water. Wiplumps are the most common, so it shouldn't take too long.
When you have two Wiplumps, head towards Ulterior Omninesia and go to the southwest corner of the corner. With Rock-Hopping gear, you can head to the floating island in the southwest corner, where you'll find Banapi, Raiber Magmis, and Mastione Temtem. Equip one of your Wiplumps with a four-leaf clover, and if you don't have one, buy some TemCards from the Mini Temporium.
This method works best with regular TemCards. TemCard+ is too expensive to achieve this cost benefit.
The reason we want these Wiplumps with the Cold Wind tech is because status effects do increase the catch rate of untamed Temtem. It's unclear exactly how much it increased, but we do know it did. Go to a random battle and use Cold Breeze on your Wiplumps, which will freeze the untamed Temtem, increasing your odds of catching it. All status effects apply a multiplier to the chance of a successful capture. The values are as follows: