So it says in the Faq and strategy guide that in order to gain the mars sigil you need to capture 10 monsters of 10 different species of 10 different regions. However in the guide the monster catching part shows that in most of the places there doesn't exist 10 different monsters that you can catch, so how do you get this mars sigil? For example "the Calm Lands" show only 9 different monsters that you can catch, Djose Shows 7 that you can catch, Thunder Plains shows 8 that you can catch, the only places that have 10 or more are Mt. Gagazet, Omega Ruins, Macalania Woods, and some others..

From Gamefaqs:

You need to unlock any combination of 10 Area Creations or Species
Creations bosses at the Monster Arena and the
trainer will give this to you. Area Creations are unlocked by capturing at
least one of each monster in a particular area, and Species Creations are
unlocked by capturing several of each monster from a particular species -
Bombs, Wolves, or Floating Eyeballs, for example (i believe 10).
And if the trainer doesn't give the Mars Sigil to you, either a) keep
chatting with him until he does, or you didn't unlock enough special bosses