Big question

There it's say we can capture a monster whit coin whit a 100% chance
http://www.haypi.com/monster2iphone/help.htm

"Coins: You can get coins by completing certain tasks or by purchasing them through the Buy Coins option. You can use coins to purchase rare items, capture monsters with a 100% success rate, clear cooldowns, and more."



How can we do that?

Dont know where you read that exactly, in HM-1 there was that option but in TLT there is not.
here is copy of TLT info:
How can I collect more monsters?

You can get a monster through sealing, synthesis, taming, egg-cracking, and tasks.

Seal

You can capture a monster by sealing it within a Seal Card. The rarer a monster is, the lower your success rate for the seal. You can weaken a monster by lowering its health before you seal it.

Synthesis

You can use a scroll to synthesize two or more monsters into a new monster. After the synthesis, you lose the original monsters. There is a chance your new monster will have higher stats than the originals.

You can find scrolls on Team Mode or Veteran Mode.

Requirements for Synthesis:
Scrolls
Monsters listed on the scrolls

Taming

As you climb up the tower, more and rarer monsters will become available for taming. Strengthen the bond with the monster to obtain it. Once the bond is maxed, the monster will become obtainable.
Requirements for Taming

Plenty of Master Points
Plenty of daily bond raises.
For powerful monsters: High position on the Lost Tower.

As we see the Bag, what we own are normal seal card. I assume that we could have "Super" and "Ultimate" seal cards as we see in Betting ̣̣(normal bet, super bet, and ultimate bet). I think this character should be updated in the new version.