Free Ferghus

So what rank do we need to reach to obtain The Ferghus? Because I know each event quest requires a free form from the next rank.

My Rank B quest says there's a medal for Rank A.

If I recall correctly, based on mine (I'm rA) the path was..

White Seal > Wild Horse > Lost Cat > ??? > Blue Footed Booby > Zebra. Then after you trans to the last one and complete the quest you recieve the medal.

Labrador Retriever fills the ??? slot.

Thanks, i just feel bad now for anyone that gets the shamala ferghus coin from the gacha right now.