You can either get them from your scourers in the Scour Areas, from a box, or from trading.
you'll need various shards for one tablet not only one
Yes.
Buy them at the Shop.
Pokefarm.
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you'll need various shards for one tablet not only one
As of right now, the shards have no use on PF, but they might in the future. It's up to you if you want to hold on to them or to sell them :3
mercury is a tablet you'll need shards (ancient power orb + shard) there are spots on the tablet, fill the matching color/element with the shards and you'll summon it i haven't found out the purple spot on the tablet myself yet since there is no purple shard...
To find Missingno on Pokefarm, you must complete a quest.
To name your Pokefarm, go to your Farm page. Under the announcement bar, you will see the words "Your Farm". Click the edit button next to it, then you can name your Pokefarm.
Go to the main Pokefarm page, and click on Doug.
You go to Miscellanous settings and then scroll down to the bottom. You can also check the Pokefarm Wiki next time :)
You do not find missingno in glitch city on pokefarm. you get missingno in the saftey matters quest.
They can't be bought. You can find them underwater, or attached to wild pokemon. Chinchou have yellow shards, Clamperl have blue shards, Relicanth have green shards and Corsola have red shards.
Yes.
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Buy them at the Shop.