Mew and Mewtwo are not found anywhere in the Sinnoh region.
You cannot catch totodile, chikorita, or cyndiquil without migrating.
What you can catch in Pokemon diamond without migrating it are legendaries are... Dialga, Azelf, Uxie, Mesprit, Heatran, Giratina, Cesselia, Regigigas, Rotom, and Celibi. Really you can find Celibi in Solaeon Ruins but it is EXTREMALY rare. A once in a lifetime and it will flee as soon as possible.
You can only get a regice, regirock, and a registeel by migrating them from ruby or Sapphire. If you migrtate these Pokemon you can also catch regigigas.
No. Unfortunately you'll have to cheat.. :'(
Safari zone
In Diamond & Pearl? Impossible without migrating, trading, or Action Replaying.
In Pokemon diamond you can catch Dialga, Azelf, Uxie, Mesprit, Cresselia and Arceus
no
You cannot catch totodile, chikorita, or cyndiquil without migrating.
no
Yes. The easiest way is to migrate. The way to do it without migrating is Route 202 (Fire Red Inserted)
Normally you need an AR, or a master ball, because once I had mesprit at 1 health and I couldn't catch it so don't try.
you cant it one of the few that you cant catch without migrating or trading
What's a waberfett? If you mean Wobbuffet you can catch it in any GBA game then migrate, though youu can catch one without migrating but the Pal Park is the easier method.
The first pokemon in the national dex is bulbasaur, which can only be obtained by trading, or by migrating from gameboy.
yes you just need Pokemon ruby,sapphire, or emerald and if you have him on it you can send him over to diamond by migrating after passing Pokemon diamond and having the national pokedex hope this helps got any other questions just send me a message at tupacfan1001@gmail.com
no