Champs Tiering Update
So this is going to be a lengthy update, as we reflect on the results of our Champions Kick-off tour and DPL. The new M-B regulation is very exciting, bringing some very significant new Pokémon and the re-introduction of important items such as Life Orb, Light Clay and Weather Rocks. Special thanks to those to the Champs tiering council being myself,
OdinRM,
Addison,
Jascha and
faygoes.
Double Mega 
The most exciting new addition to the rules is that we are now allowing double mega! Given the overwhelming community sentiment for double mega to be allowed in singles, as well as practical reasons, such as a large portion of the current dex being megas, we have decided it is time to experiment with allowing it.
Mega Budget 
However, we have allowed it with a mega budget of 22, between a maximum of 2 megas. The reason for this is that there were concerns that ‘broken’ double mega combinations could theoretically become available, such as Mega Clefable - Mega Garchomp. This could be revised in future, but for the purposes of DPL, we wanted to remain relatively conservative while we trial this new rule.
Item Clause Vote 
Preceding DCL, we wanted to trial the use of the item clause. That is why the Champions Kick-off tour had an item clause, while DPL did not. Ultimately, we put it to a vote, which was 4-1 in favour of no item clause. The reason for this was that, as a draft format, Champs already has very limited items available in the dex. Restricting these even further, especially given the amount of strong Pokémon, such as Mega Raichu Y (Spoiler) and Mega Delphox are available, was seen as too debilitating and ultimately, it would be more competitive not to restrict item usage. The contrasting argument for keeping item clause was to make this format as close to cartridge as possible, as well as there being a skill element to item clause; being able to figure out what Pokémon has what item enables you to play with the requisite knowledge in working out what other Pokémon are holding.
Ultimately, we will be moving forward with
no item clause for DCL but there might be room for considering item clause in future tours as the format develops.
M-B additions

There was some discussion about the legality of Mega Raichu Y, including one vote for ban. However, we have opted to let it remain free for now, citing its paper-thin defenses, the presence of pokemon faster than it such as Mega Delphox and Aero, as well as the amount of powerful priority in the format. It will start at 19 points.

Mega Mawile will start at 18 points, as one of the strongest pokemon in the format, bolstered by the lack of Rocky Helmet. However, we believe it will remain manageable given its poor speed tier and the presence of other powerful megas in the format.

Gholdengo, despite the sizable nerf to its signature move, Make It Rain, will start at 18 points as the premier spin-blocker in a tier without Heavy Duty Boots and strong spammable STABs.

In past generations, Mega Blaziken and Mega Metagross have been too strong to allow in both standard and draft play. We think that remains the case and both are
banned.

Mega Barbarcle was
banned in a 4-1 vote due to the insane combination of strong STAB moves, a broken setup move in Shell Smash, and Light Clay now making Screens Strategies stronger. At +2, Mega Barb OHKOes almost everything in the dex.

With access to Wave Crash and the Damp Rock reintroduced, Mega Swampert brings new viability to rain as a scary sweeper and breaker. We have decided to start it off at 15 points.
Dragapult Ban

With its stellar speed tier, unresisted stab combination and extreme versatility, Dragapult put in a phenomenal showing in DPL and proved to be very difficult to handle. As a result, we have decided to ban it as it is clearly the best Pokémon in the meta, in a 3-2 vote. We might revisit this as the dex gets bigger and more Pokémon become available.
Notable Raises

The consensus best mon in the format by champs players, Garchomp, was raised to 20.

Palafin had a fantastic showing in DPL and Kick-off and was raised to 18.

Wide Lens has allowed Maushold better use of its signature move, Population Bomb, and thus we have raised it to 9.

Hisuian Samurott had a fantastic showing in DPL and Kick-off and was raised to 16.

All the weather setters received a point increase with the weather rocks back in the game.

Corviknight and Skarmory were shown to be the premier defensive steels in the format, and have received commensurate raises.

To balance the double mega rule, numerous megas, such as Mega Garchomp, Mega Clefable and Mega Skarmory, were raised to reflect their flexibility.
Drops

Mega Floette had a very poor showing in DPL and Kick-off. It is simply not as strong in doubles, where it does not have the support to overcome its lack of coverage and middling bulk. We have dropped its price to 16 to reflect this.

Mega Excadrill is, quite frankly, worse than its non-mega version. We have dropped it to 11.

We have also dropped a number of the lower-tier megas to incentivise their usage.
See the full Champs tiering changes
here.