Find a Dragon Scout mob - he is wandering somewhere in the plains biome. Attack him, and the hunters' camp will appear.
Hunters camp is a big group of Illagers that should be defeated. Among them, there is Dragon Wizard that will drop a Ferox Dragon spawn egg.
Use a Ferox Dragon spawn egg, and the dragon will appear - give him cod to tame.
A tamed dragon will follow you, fight on your side, and can be used as a mount.
There are a few other dragon species in this addon. Velox Dragons - can be found in a Snowy Taiga Mountains biome and only during sunrise or sunset. Wyvern is another dragon that can be found in Swamp Hills - it can be tamed with tropical fish.
How to install addons:
- Download addon straight from your device
- Find and open .mcpack or .mcworld files that you download earlier
- Click it to import into Minecraft Pocket Edition
- Open the game
- Create a new world or edit an existing world
- Scroll down to Add-ons section and select the ones you want to apply
- Make sure to enable "Experimental Gameplay"