How do you get to level 19 and how many vivosaurs are there?

There are 150 regular vivosaurs in the game. 30 of these evolve into new vivosaurs using the miraculous fossils, so-180 so far.
151-157 are the bonysaurs you get by battling Lola, Cole and Lester post game.
158-162 are the zombisaurs you get from defeating Zongazonga twice.
163 & 164 are Igno and Frigi, available as bonus data on the Nintendo wifi connection.
165-169 are the so-called 'chicken' vivosaurs. Originally from FF as prizes for ranking up all of a type of vivosaur up to rank 12, they are now in FFC as prizes for completing specific side missions.
170 is the Saladasaurus, 171-174 are Dinomaton, Duna, Raptin and Dynol, all available as bonus data like Igno and Frigi.

You get to level 19 by finishing missions and by fighting battles. For example, with the guy making hot springs eggs, you have to have at least one time where you get 10 seconds exactly. I think you have to fight everyone in the park at least once, finish all the tournaments on the three islands, then the champion's tournament on the BB Brigade base island, do all the side missions and collect all the vivosaurs to reach level 20.
Hope this helps. Good luck!

Finish more side-quests to level-up. And there are 174 vivosaurs in the game. 149 regulars and the rest are earned by beating Robinson, Ryne,(downloadable side-quest)Duna, Raptin, and Dynal,(another side-quest from downloads) 2 that just appear in the fossil lawn after downloads, 5 chickens that are side-quest rewards, 5 from beating the side-quest in zongazonga's castle, and 7 boneysaurs for beating Cole, Lester, and Lola again.

do I get all the vivosaurs in fossil fighters champions because I did all that but I am missing some vivosaurs and did the tourtaments and side missions