only reason to do the crater town dungeon is to get Victini for new players or do 1 run each month for the shadow area.
Here is the list of the top guilds in silver server last month:
Only 3 Guilds finished at least 1 run, and the runs done arent even that great.
It doesnt make sense, that you get with 1 lavender run, which you can do in about 15 min, better rewards than in a whole Victini run, which is way harder and takes like 40 min.
Also Victini is the dungeon with the most bugs of them all, which also decreases the motivation in doing that dungeon.
Some ideas for better rewards:
increase the pve coins you get to 20 at least
2 reroll shards at least
more drops of sellable items like nuggets,pearls etc
make mons to catch syncable and better (some of them are not even rare iirc)
maybe some sort of currency(like glitter) with that you can buy interessting stuff like chromas or other cosmetics