Pandemona- Level                  HP               Atk Power 1                        N/A                    N/A 19                      1442                   1052 20                      1506                   1092 30                      2146                   1466 40                      2794                   1840 50                      3450                   2213 60                      4114                   2587 70                      4786                   2961 80                     5466                   3335 90                      6154                   3708 100                    6850                   4082

To get Pandemona you draw it from Fujin during the boss fight with Fujin and Rajin.(disc.2)

Cerberus- Level               HP                   Atk.Pow 1                     N/A                    N/A 10                   N/A                    N/A 23                   1490                   N/A 30                   1876                   N/A 40                   2434                   N/A 50                   3000                   N/A 60                   3574                   N/A 70                   4156                   N/A  80                   4746                   N/A 90                   5344                   N/A 100                 5950                   N/A

You can challenge Cereberus while your in the main hall of Galbadia    Gardens.(Disc.2)You must defeat Cereberus before he will join your party.

Alexander- Level              HP                   Atk Pow 1                     N/A                    N/A      10                   N/A                    N/A 25                   1925                  1350 30                   2266                  1542 40                   2954                  1920 50                  3650                   2298 60                  4354                   2676 70                  5066                   3054 80                  5786                  3432 90                  6514                   3810 100                7250                   4188

You must draw Alexander from Edea during the Boss Fight  inside Galbadia Gardens(disc.2).

Doomtrain- Level                  HP                Atk Pow 1                       n/a                     n/a     10                     n/a                     n/a 28                     2521                   1931 30                     2686                   2028 40                     3514                   2509 50                     4350                   2990 60                     5194                   3471 70                     6046                   3953 80                     6906                   4434 90                     7774                   4915 100                   8650                   5396

Find a ring called the Solomin Ring at Tears Point in Esthar.Also you need these six items Malboro Tentacles,Remedy,and Steel Pipes and use the ring.Doomtrain will accept the items and join your party.(First avialable on disc 3)