1-If there is more than one dragon token on the case , do we draw one card from each deck if we want to encounter the token?
I really need to read more:
The character then takes one dragon scale from the Dragon
King’s card and places it on the character’s space. If the space
already has a dragon scale, it is placed in the next space
counterclockwise that does not already have a dragon scale.
If every space in the Region already has a dragon scale, the
dragon scale is discarded and the character must suffer the
Dragon Rage of the Dragon King instead (see “Dragon Rage”
on page 15). The two remaining dragon scales on the Dragon
King’s card are discarded, and the character continues his
turn as normal.
I think you've found your answer. You cannot have more than 1 dragon scale (token) on the same space.
2- we can do more than 1 battle on the same case right? Like a psychic battle then a physical battle ?
This question was due to some reading but confirmation could be great.
When you encounter more Enemies on the same space, you have to group all Enemies with encounter number 2 (Strength Enemies) and encounter number 3 (Craft Enemies). You encounter the Enemies with the lowest encounter number first (=Strength Enemies); if you're not defeated, you encounter the next group of Enemies (Craft Enemies). Yes, you can have more than 1 battle on the same space in the same turn.
3- When can we call the escape from enemy ? Let's say i encounter a dragon , I got the spell invisibility , can I cast it after i rolled my attack and would have lost? And if there's an object after the dragon , I won't be able to take it right?
"Evading" is an action granted by Spells or special abilities. You must Evade Enemies before rolling the die for attack. If ALL Enemies on the space have been defeated or evaded, you may encounter cards with Encounter numbers 4,5,6 (Strangers, Objects and Followers, Places).
I suggest you read the base game rulebook again; it contains these answers and a lot more.