If you install a mod it will work in all gamemodes.
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There is no such thing as Pokemon "MODE", but there is a pokemon "MOD" which you can install.
If you have the aether mod installed, you sure can.
It is impossible to get flint and steel in creative mode on Pocket Editions unless you have a mod.
It depends which mod you are using. There are many different mods that add Herobrine into Minecraft, you'd have to look at each specific mod to see.
There is no button to spawn eggs in minecraft, unless you are in creative mode in which case you press the Inventory button. Creative mode can be made to happen when you create a creative world or install a mod that lets you switch gamemodes ingame.